A train 150 m long passes a pole in 15 seconds and crosses another train of the same length travelling in opposite direction in 8 seconds . The speed of the second train in (km/h) is __

A 60 km /hr
B 66km /hr
C 72 km / hr
D 99 km / hr

Correct Answer: 99 km / hr

Speed of the first train = 150/15 = 10 mps. speed of the second train = x mps. According to the question: x + 10 = (150 + 150)/8 x = 27.5 mps = 27.5 × 3600/1000 = 99 kmph. Ans: D
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