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The distance from city A to city B is 240 miles. Bob travels from city

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The distance from city A to city B is 240 miles. Bob travels from city  [#permalink]

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New post Updated on: 17 Dec 2018, 22:54
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D
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  45% (medium)

Question Stats:

66% (01:41) correct 34% (01:37) wrong based on 66 sessions

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The distance from city A to city B is 240 miles. Bob travels from city A to city B and returns by the same route. Was the time taken for the entire journey less than 13 hours ?


(1) The speed during the entire journey varied between 20 mph and 36 mph.

(2) The average speed was 30 mph.

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Originally posted by ksrutisagar on 17 Dec 2018, 22:18.
Last edited by Bunuel on 17 Dec 2018, 22:54, edited 1 time in total.
Renamed the topic and edited the question.
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Re: The distance from city A to city B is 240 miles. Bob travels from city  [#permalink]

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New post 17 Dec 2018, 23:58
Hi,

It’s a straight forward question.

Given,

Distance between A and B is 240 miles.

Bob travels from city A to city B and returns by the same route.

So, total distance he travelled is 480 miles.

Question:

Was Time taken for the entire journey is less than 13 hours ?

We know that,

Time taken = total distance / Speed.

Statement I is sufficient:

The speed during the entire journey varied between 20 mph and 36 mph.

Even if we take the highest speed in the above given range, still the total time taken would be more than 13 hours.

i.e.,

time taken = 480/ 36

= 13.333

So, it we take the speed further less, then time taken will be ofcourse more than 13.33hours.

Answer to the question is always NO.

So statement I is sufficient.

Statement II is sufficient:

The average speed was 30 mph.

We know that,

Average speed = total distance / total time taken

30 = 480/ total time taken

Time taken = 16 hours.

Again answer to the question is NO.

So sufficient.

So the answer is D.

Hope this helps.


Regards,
Junaid.
Byjus GMAT Quant Expert
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Re: The distance from city A to city B is 240 miles. Bob travels from city   [#permalink] 17 Dec 2018, 23:58
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