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# Need shorter way to solve the train crossing problem

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Joined: 24 Sep 2017
Posts: 3
Need shorter way to solve the train crossing problem  [#permalink]

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Updated on: 17 Oct 2017, 12:30
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Difficulty:

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Question Stats:

100% (02:40) correct 0% (00:00) wrong based on 12 sessions

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A train X departs from station A at 11.00 am for station B, which is 180 km away. Another train Y departs from station B at 11.00 am for station A. Train X travels at an average speed of 70 kms/hr and does not stop any where until it arrives at station B. Train Y travels at an average speed of 50 kms/hr, but has to stop for 15 minutes at station C, which is 60 kms away from station B enroute to station A. Ignoring the lengths the train, what is the distance, to the nearest km, from station A to the point where the trains cross each other?

A. 112
B. 118
C. 120
D. 122
E. Cant be determined

I have solved the problem, but I want to get smarter way to solve it. Please help.

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Originally posted by anupamdev on 17 Oct 2017, 12:14.
Last edited by anupamdev on 17 Oct 2017, 12:30, edited 1 time in total.
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Re: Need shorter way to solve the train crossing problem  [#permalink]

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17 Oct 2017, 12:24
anupamdev wrote:
A train X departs from station A at 11.00 am for station B, which is 180 km away. Another train Y departs from station B at 11.00 am for station A. Train X travels at an average speed of 70 kms/hr and does not stop any where until it arrives at station B. Train Y travels at an average speed of 50 kms/hr, but has to stop for 15 minutes at station C, which is 60 kms away from station B enroute to station A. Ignoring the lengths the train, what is the distance, to the nearest km, from station A to the point where the trains cross each other?

I have solved the problem, but I want to get smarter way to solve it. Please help.

Hi anupamdev

Can you present the question is a GMAT format? Users will not be able to help you out if not presented in GMAT style.
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Joined: 02 Sep 2009
Posts: 49300
Re: Need shorter way to solve the train crossing problem  [#permalink]

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18 Oct 2017, 08:07
anupamdev wrote:
A train X departs from station A at 11.00 am for station B, which is 180 km away. Another train Y departs from station B at 11.00 am for station A. Train X travels at an average speed of 70 kms/hr and does not stop any where until it arrives at station B. Train Y travels at an average speed of 50 kms/hr, but has to stop for 15 minutes at station C, which is 60 kms away from station B enroute to station A. Ignoring the lengths the train, what is the distance, to the nearest km, from station A to the point where the trains cross each other?

A. 112
B. 118
C. 120
D. 122
E. Cant be determined

I have solved the problem, but I want to get smarter way to solve it. Please help.

Please read carefully and follow our RULES OF POSTING. Thank you.

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

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Re: Need shorter way to solve the train crossing problem &nbs [#permalink] 18 Oct 2017, 08:07
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# Need shorter way to solve the train crossing problem

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