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At what speed was a train traveling on a trip when it had

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At what speed was a train traveling on a trip when it had [#permalink] New post 13 Dec 2012, 04:52
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At what speed was a train traveling on a trip when it had completed half of the total distance of the trip?

(1) The trip was 460 miles long and took 4 hours to complete.
(2) The train traveled at an average rate of 115 miles per hour on the trip.
[Reveal] Spoiler: OA

Last edited by Bunuel on 21 Jul 2013, 10:32, edited 1 time in total.
Edited the OA.
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Re: At what speed was a train traveling on a trip when it had [#permalink] New post 13 Dec 2012, 04:58
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At what speed was a train traveling on a trip when it had completed half of the total distance of the trip?

Notice that we are not told that the train travels at a constant speed.

(1) The trip was 460 miles long and took 4 hours to complete --> the average speed of the train was 460/4=115 miles per hour, but we don't know what was the speed of the train when it had completed half of the total distance (230 miles). Not sufficient.

(2) The train traveled at an average rate of 115 miles per hour on the trip. The same as above. Not sufficient.

(1)+(2) We only know that the average speed of the train was 115 miles per hour, which is not enough to determine the speed of the train when it had completed half of the total distance (230 miles). Not sufficient.

Answer: E.
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Re: At what speed was a train traveling on a trip when it had [#permalink] New post 17 Dec 2012, 10:57
why is the official answer D?
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Re: At what speed was a train traveling on a trip when it had [#permalink] New post 25 Dec 2012, 04:20
The OA is E. It is given in the OG as well
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Re: At what speed was a train traveling on a trip when it had [#permalink] New post 01 Aug 2013, 10:29
At what speed was a train traveling on a trip when it had completed half of the total distance of the trip?

(1) The trip was 460 miles long and took 4 hours to complete.
The train could have been moving at a slower speed for the first part of the trip then faster for the second part to complete the journey in 4 hours.
INSUFFICIENT

(2) The train traveled at an average rate of 115 miles per hour on the trip.
We know nothing about distance and it's possible that the train was traveling at a slower rate for the first part of the trip then faster for the second part of the trip to average out to 115 MPH.
INSUFFICIENT

1+2)
There still is not enough information to solve for this problem. We know that the train averaged 115MPH and that it took four hours to complete the trip (i.e. it took 4 hours) but the train could have moved slower for the first portion of the trip and faster for the second portion of the trip. there is no way of knowing for sure.
INSUFFICIENT

(E)
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Re: At what speed was a train traveling on a trip when it had [#permalink] New post 15 Sep 2014, 06:42
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Re: At what speed was a train traveling on a trip when it had   [#permalink] 15 Sep 2014, 06:42
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