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Rate and Work .Data Sufficiency

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by majorsheetal » Tue Sep 28, 2010 1:53 am
A courier delivered a package from place X to place Y . At what average speed did he travel during the return trip?

1. The distance between X and Y was 25 miles .

2. The couriers round trip travel time was 50 minutes.

My answer to it is C. but it is wrong ans is E.

I thought the avg speed = total distance / total time.
= 50/50

hence the speed would be 1 mile per hr.please how is it wrong???
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by hi.itz.mani » Tue Sep 28, 2010 2:06 am
1st question : Whats the source of this problem?

Now secondly, I will be frank to you. If I had seen this problem, I would have also simply marked C and would have happily lived ever after. But If you look into the question with a magnifying glass. You will find the question is not about average speed of the journey. ( Which would have been total distance of the journey / total time taken ). The question is average speed of his return journey. Which in this case will be
25 / time taken for return journey.


Again as I said earlier My explaination is totally based on the correct answer and this is the reason we emphasize on not sharing the OA and giving every one a fair chance to learn and solve the problem

Thanks!
-Mani
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by majorsheetal » Tue Sep 28, 2010 3:53 am
Ok
Thanks Mani.

Actually i had to give this answer choice becoz i made the mistake and wanted to know the correct answer..

Any ways the source of the material is IMS prep material
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by gmatmachoman » Tue Sep 28, 2010 11:26 pm
majorsheetal wrote:Ok
Thanks Mani.

Actually i had to give this answer choice becoz i made the mistake and wanted to know the correct answer..

Any ways the source of the material is IMS prep material
Don't use IMS prep material..It will "damage" ur prep!! Use recognised/authenticated prep material
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