The Loetschberg tunnel was built to connect Bern, Switzerland, with the ski resorts in the southern


Swiss Alps. This was accomplished by the Swiss using one engineering company that started at the


north end and another company that started at the south end. Suppose the company at the north end


could drill the entire tunnel in 22. 2 years and south company could do it in 21. 8 years. How long would


it have taken the two companies to drill the tunnel?

Answers

Answer 1

It would have taken the two companies approximately 10.92 years to drill the tunnel.

The Loetschberg tunnel was built to connect Bern, Switzerland, with the ski resorts in the southern Swiss Alps. The construction of the tunnel was accomplished by two engineering companies that started at the north end and the south end, respectively. If the company at the north end could drill the entire tunnel in 22.2 years, and the south company could do it in 21.8 years, we can calculate the length of time required for the two companies to drill the tunnel.To calculate the time required for the two companies to drill the tunnel, we can use the following formula:Time = (AB)/(A+B)where A is the time required by the first company, and B is the time required by the second company, and AB is the product of A and B.Using this formula, we can calculate the time required for the two companies to drill the tunnel as follows:Time = (22.2 × 21.8) / (22.2 + 21.8)= 480.36 / 44= 10.92 yearsTherefore, it would have taken the two companies approximately 10.92 years to drill the tunnel.

Learn more about Approximate here,what is to find an approximate value for a number is called?

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Related Questions

1) Find the linear equation from the
graph:

Answers

Answer:

y = -1/2 x - 3

Step-by-step explanation:

Use the coordinates from the graph:

(-6, 0) and (0, -3)

Slope m = -3-0/0-(-6)

m = -3/6

m = -1/2

The y-intercept is -3 (point where the line meet the y intercept)

Substitute unto the expression y = mx+c

y = -1/2 x - 3

Hence the required equation is y = -1/2 x - 3

What is the area of this?

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Answer:

49 cm²

Step-by-step explanation:

G(x)=-x-3, find g(1)

Answers

Answer:

G(1) = -2

Step-by-step explanation:

for G(1) replace x with 1

G(1)=1-3

subtract

1-3 = -2

so G(1) = -2

simplify Cos(a+b) +Cos(a+b)​

Answers

At the risk of piling on after correct answers have already been given, I’ll offer another way to address this problem. Recall that, if
θ
is real, cos()=Re()
cos

(
θ
)
=
R
e
(
e
i
θ
)
. So, with
A
and
B
real,

(+)+(−)=(+−)=2cos()
e
i
(
A
+
B
)
+
e
i
(
A

B
)
=
e
i
A
(
e
i
B
+
e

i
B
)
=
2
e
i
A
cos

(
B
)

Finally,

cos(+)+cos(−)=Re((+)+(−))=Re(2cos())
cos

(
A
+
B
)
+
cos

(
A

B
)
=
R
e
(
e
i
(
A
+
B
)
+
e
i
(
A

B
)
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=
R
e
(
2
e
i
A
cos

(
B
)
)

=2cos()cos()

is this right if it's not can you help me please

Answers

Answer:

I think its right. It look good to me. But always make sure its right before submitting

2/16 2 + x = 12
what is the answer to this equation?

Answers

Answer:

nomelase pero será chida la imagen que tienes

A number cube is numbered 1 through 6. What is the theoretical probablity of rolling an even number?

Answers

A 3/6 of a chance because there’s 3 even numbers also 50% chance or 1/2 chance
It’s 1/2! Or you could say 3/6. This is because in 1-6 there are 3 even Numbers and that would be half of the 6 sides are even numbers! Hope this helps! :)

I will mark you brainliests help me with this please ​

Answers

Answer:

[tex]G=cos(x) -1[/tex]

Write the equation for this line in slope-intercept form.
y=-2x+?

A. -4
B. 2
C. -2
D. -1/2


Please explain as simply as you can I'm really struggling. Also will give brainly

Answers

Answer:

The answer is A. -4.

Step-by-step explanation:

The missing value you are looking for is the y-intercept or where the line crosses the y axis.

Your answer would be A. -4 because that’s where your line intercepts the y-axis

Write a Haiku about science please! Have a great day :)

Answers

Answer:

in Earth, space, the trees

science is all around us

answer life's questions

Step-by-step explanation:

Haikus must be written with 5 syllables in the first line, 7 in the second, and 5 again in the 3rd, so they are naturally limited and simplistic. Hope this helps, and brainliest is always appreciated! Enjoy your day bro!

a train travels 16 miles in 20 minutes . at this rate how many minutes will it take to tavel 12 miles

Answers

Answer:

15 minutes

Step-by-step explanation:

distance = rate · time

16 = 20r

r = 16/20 or 4/5 miles per minute

12 = 4/5·t

4t = 12·5

t = 60/4 or 15 minutes

I got it wrong and I don't have time to fix it, I don't know how to delete my response do just report this I guess ;-;

hi hello! please help me.

Answers

Answer:

x= -4

Step-by-step explanation:

hope it's helpful to you

Answer:

A) x= -4

Step-by-step explanation:

To solve you must isolate the variable. Do this by using the properties of equality to subtract and divide numbers from both sides of the equation. First, subtract 8x to move all x terms to the right side.

-48=12x

Then, divide both sides by 12

-4=x

Please help me :(.......

Answers

Answer:

He makes £470 profit

Step-by-step explanation:

He pays $160 for 60 jumpers.

He sells 80% (48) for $12 each. Income of $576

He puts the remaining (12) on sale for one full one half off.

He sells 3 for half price ($6) and 3 for full price ($12) Income of $54

$576 + $54 = $630

$630 - $160 = $470

In pounds sorry about the USD

Need help ASAP
Thankss + BRAINLIST only for correct answer

Answers

Answer:

             y = 4

Step-by-step explanation:

x + 2y = 10    ⇒  2y - 10 = -x

-x + 4y = 14

2y - 10 + 4y = 14

6y = 24

 y = 4

is y = -x a proportional relationship

Answers

Answer:

For any proportional relationship, k=yx (such as a line that passes through the origin). Find the equation of the line by solving for y in the constant of proportionality equation. This equation y=kx is another representation of a proportional relationship.

Step-by-step explanation:

Answer:

Yes kdsjsbahajajsjsbsbsbsnsn

help asap look at ss

Answers

Answer:

they are 3

Step-by-step explanation:

Which of the following sets of side
lengths would not form a triangle?
A 29, 39, 69
B 29, 38, 49
C 29, 41, 19
D 29, 37, 10

Answers

Answer:

A

Step-by-step explanation:

Because 29+39=68

68<69

therefore this would not make a triangle!

Answer:

A.

Step-by-step explanation:

29 + 39 = 68 which is less than 69 so A is not a triangle.

find x=, if x+4=10 please hurry!!!

Answers

The answer is x= 6

6 + 4 is = 10.

Answer:

x=6

Step-by-step explanation:

+4=10

+4-4=10−4

x=6

sole this question ?
30÷5+(9×5)-3²=

Answers

Answer:

30÷5+(45)-96+45-942I do exams and quizzes if ur interested

Answer:

42

Step-by-step explanation:

30/5 + ( 9)(5)−32

= 6 + ( 9)(5)−32

= 6 + 45−32

= 51 − 32

= 51 − 9

= 42

hope I helped!!

Inequality from graph
Choose the inequality that represents the following graph.
MY
Cou
-5
14
13
12
+
5
1
0
1
2
3
4
MY
Choose 1 answers
Pro
21
Pro
Теа
2011
2-1
2-1
Hi

Answers

Answer:

A. x < -1

Step-by-step explanation:

Because the direction of the vector is less than -1 and the dot on -1 isn't filled (not equal to)

Answer:

option a and b is the inequality that represents the following grap

Reasoning. A​ salesperson's commission rate is 6​%. What is the commission from the sale of $35,000 worth of​ furnaces? Use pencil and paper. Suppose sales would double. What would be true about the​ commission? Explain without using any calculations.

Answers

Answer:2,100

Step-by-step explanation:

Select one or more expressions that together represent all solutions to the equation.
sin(x)=-0.7

Answers

Answer:

A. [tex]x_{1} = -44.427^{\circ}\pm n\cdot 360^{\circ}[/tex]

B. [tex]x_{2} = -135.573^{\circ}\pm n\cdot 360^{\circ}[/tex]

Step-by-step explanation:

The negative value of the sine function indicates that [tex]x[/tex] is located at third and fourth quadrants. Besides, this function has a period of 360º. There are two families of solutions:

[tex]x_{1} = \sin^{-1} (-0.7)[/tex]

[tex]x_{1} = -44.427^{\circ}\pm n\cdot 360^{\circ}[/tex]

[tex]x_{2} = \sin^{-1} (-0.7)[/tex]

[tex]x_{2} = -135.573^{\circ}\pm n\cdot 360^{\circ}[/tex]

Hence, right answers are A and B.

the next term of the square 3 by 1​

Answers

9514 1404 393

Answer:

  (B)  1/27

Step-by-step explanation:

The terms of the sequence have a common ratio.

  (1/8)/(3/16) = (2/16)/(3/16) = 2/3

  (1/12)/(1/8) = (2/24)/(3/24) = 2/3

  (1/18)/(1/12) = 12/18 = 2/3

The next term will be ...

  (1/18)(2/3) = 2/54 = 1/27 . . . . matches choice B

56 boys and 34 girls visit a zoo.
46 of these children have a voucher.
Three times as many boys as girls do not have a voucher.
Complete the frequency tree.

Answers

Answer:

the amount of boys that HAVE a voucher is 23

the amount of girls that HAVE a voucher is 23

Step-by-step explanation:

Answer: follow for more answers concerning maths, biology physics and chemistry

Step-by-step explanation:

PLEASE IF U KNOW ANSWER HELP ME I NEED IT IN NEXT 10 MINUTES

Answers

Answer:

x + 2y - 3 = 0

Step-by-step explanation:

Coordinates of the points P and Q are (-3, 0) and (0, 6) respectively.

Slope of PQ = (0- 6)/(-3 - 0) = - 6/-3 = 2

Slope of line perpendicular to PQ = - 1/2

Since, required line passes through point R(7, - 2) and is perpendicular to PQ.

Therefore, equation of line in point slope form is given as:

[tex]y - (-2) = - \frac{1}{2} (x - 7) \\ \\ y + 2 = - \frac{1}{2} (x - 7) \\ \\2(y + 2) = - (x - 7) \\ \\ 2y + 4 = - x + 7 \\ \\ 2y + 4 + x - 7 = 0 \\ \\ x + 2y - 3 = 0[/tex]

Therefore x + 2y - 3 = 0 is the required equation of line.

Answer:

Answer:

x + 2y - 3 = 0

Step-by-step explanation:

Coordinates of the points P and Q are (-3, 0) and (0, 6) respectively.

Slope of PQ = (0- 6)/(-3 - 0) = - 6/-3 = 2

Slope of line perpendicular to PQ = - 1/2

Since, required line passes through point R(7, - 2) and is perpendicular to PQ.

Therefore, equation of line in point slope form is given as:

\begin{gathered}y - (-2) = - \frac{1}{2} (x - 7) \\ \\ y + 2 = - \frac{1}{2} (x - 7) \\ \\2(y + 2) = - (x - 7) \\ \\ 2y + 4 = - x + 7 \\ \\ 2y + 4 + x - 7 = 0 \\ \\ x + 2y - 3 = 0\end{gathered}

y−(−2)=−

2

1

(x−7)

y+2=−

2

1

(x−7)

2(y+2)=−(x−7)

2y+4=−x+7

2y+4+x−7=0

x+2y−3=0

Therefore x + 2y - 3 = 0 is the required equation of line.

hope it helps you

Larry's small business has $60,000 dollars in its account and makes automatic
monthly payments that total $12,000.

Answers

Answer:

nice flex

Step-by-step explanation:

A recipe uses 3/8 cup of water and 2 cups of flour. Write the ratio of water to flour as described by the recipe. Then find the value of the ratio. PLEASE HELP

Answers

Answer:

2.29*20 = 45.80 and 3.49*35 = 122.15.

Step-by-step explanation:

Which expression represents the algebraic phrase "nine times a number plus thirteen"? 9 minus y + 13 9 + y minus 13 9y + 13 13y + 9

Answers

9y+13 would be correct

Answer:

dddddddddddddv

Step-by-step explanation:

Someone please help! ​

Answers

Answer:

12 and 21

Step-by-step explanation:

Simplify the expression. -6 1/3-1/2(1/2+x)

Answers

Answer:

-79/12 - x/2

Step-by-step explanation:

Simplify ⏬

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