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John travelled for 12hrs. What is the total average speed? 1) For the

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John travelled for 12hrs. What is the total average speed? 1) For the [#permalink]

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New post 31 Jul 2017, 01:07
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A
B
C
D
E

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  35% (medium)

Question Stats:

63% (00:46) correct 37% (01:22) wrong based on 127 sessions

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John travelled for 12hrs. What is the total average speed?

1) For the first 8hrs, he travelled 60miles per 1hr.
2) For the last 8hrs, he travelled 50miles per 1hr.

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John travelled for 12hrs. What is the total average speed? 1) For the [#permalink]

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New post Updated on: 02 Aug 2017, 06:32
A is clearly insufficient as we don't have any idea bout last 4 hours.
B is wrong for the similar reason.

Combining,
For the first 8hrs, he travelled 60miles per 1hr.
For the last 8hrs, he travelled 50miles per 1hr.
60mph
|--------|----|
    50mph
|----|--------|

There is some overlap period (of 4 hours). We can't conclude anything as we can't assume anything.

So, E.

Originally posted by AkshayKS21 on 31 Jul 2017, 09:21.
Last edited by AkshayKS21 on 02 Aug 2017, 06:32, edited 1 time in total.
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Re: John travelled for 12hrs. What is the total average speed? 1) For the [#permalink]

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New post 02 Aug 2017, 00:55
==> In the original condition, he is travelling 12 hours, and for con 1) and con 2), it is divided into 8hrs each. Thus, the distance of first 4hrs, the second 4hrs, and the last 4hrs are unknown, hence there are too many variables.

The answer is E.
Answer: E
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Re: John travelled for 12hrs. What is the total average speed? 1) For the   [#permalink] 02 Aug 2017, 00:55
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