A smart question for you !

[bomaha]

An employee is driving his car back and forth to his job using the same road.

If his average speed in the first way is 40 km/h, and his average speed in the second way is 30 km/h, and he needs an hour for the back and forth trip together. What is the distance that it takes him to go his job back and forth?

I hope the wording is clear.

[dessskris]

speed 1 = 40 kmph

speed 2 = 30 kmph

total time = 1 h

distance?

speed=distance/time

let a be time 1

let b be time 2

is that correct?

Edited November 8, 2011 by Desy Glau

[DeBrogliez]

speed 1 = 40 kmph

speed 2 = 30 kmph

total time = 1 h

distance?

speed=distance/time

let a be time 1

let b be time 2

is that correct?

You're correct

But I think that is twice the distance

So your answer should be 34.28/2

Which is 17.14 km

[bomaha]

speed 1 = 40 kmph speed 2 = 30 kmph total time = 1 h distance? speed=distance/time let a be time 1 let b be time 2 is that correct?

Correct ! Nice work ! BTW this is a one-minute question.

speed 1 = 40 kmph

speed 2 = 30 kmph

total time = 1 h

distance?

speed=distance/time

let a be time 1

let b be time 2

is that correct?

You're correct

But I think that is twice the distance

So your answer should be 34.28/2

Which is 17.14 km

Desy is correct. The distance is 240/7.

Edited November 8, 2011 by bomaha

[DeBrogliez]

Oh! Nevermind.

I thought the question is asking about the distance between the house and his job.

In that case it would be half the answer.

Well done Desy!