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]

13 Dec 2012, 05:52

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10% (01:35) correct

89% (00:31) wrong

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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.

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Re: At what speed was a train traveling on a trip when it had [#permalink]

13 Dec 2012, 05:58

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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]

17 Dec 2012, 11:57

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]

25 Dec 2012, 05:20

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] 25 Dec 2012, 05:20

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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

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