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# Two trains starting from cities 300 miles apart head in oppo

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Two trains starting from cities 300 miles apart head in oppo [#permalink]  19 Oct 2017, 01:25
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100% (00:51) correct 0% (00:00) wrong based on 2 sessions
Two trains starting from cities 300 miles apart head in opposite directions at rates of 70 mph and 50 mph, respectively. How long does it take the trains to cross paths?

[Reveal] Spoiler: OA
2.5 hrs.

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Joined: 20 Apr 2016
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Re: Two trains starting from cities 300 miles apart head in oppo [#permalink]  19 Oct 2017, 01:40
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Bunuel wrote:
Two trains starting from cities 300 miles apart head in opposite directions at rates of 70 mph and 50 mph, respectively. How long does it take the trains to cross paths?

[Reveal] Spoiler: OA
2.5 hrs.

Kudos for correct solution.

When two trains are in opposite direction we add up the speed to get the relative speed i.e = 70 + 50 =120 mph

Now Time = $$\frac{Distance}{speed} = \frac{300}{120}$$ = $$2.5 hours$$
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Re: Two trains starting from cities 300 miles apart head in oppo   [#permalink] 19 Oct 2017, 01:40
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