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May 20 2017
Question A train of length 150 m takes 10 sec to cross another train 100 m long coming from the opposite direction. If the speed of first train is 30 km/hr. what is the speed of second train?
Answer

Time taken to cross the trains = (150 + 100)/[(25/3) + x], where x is the speed of train.

Therefore, 10 = (250 * 3)/(25 + 3x)

250 + 30x = 750

30x = 500

x = 50/3 m/s

therefore, x = (50/3) * (18/5) = 60 km/hr

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