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15 March, 21:03

A train leaves a station and travels north at 50 km/hr. FourFour hours later, a second train leaves on a parallel track and travels north at 90 km/hr. How far from the station will they meet?

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  1. 15 March, 21:10
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    Four hours later means the second train must catch up 50*4=200 km.

    The difference in speed is (90-50) = 40 km/hour.

    Time to catch up = 200 km/40 km/hour = 5 hours.
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