Question
A train running at a speed of 72 km/h crosses another
train running in the opposite direction at 54 km/h in 12 seconds. The length of the first train is 150 meters. What is the length of the second train?Solution
Relative speed of the trains = 72 + 54 = 126 km/h = (126 * 1000) / 3600 = 35 m/s. Time taken to cross = 12 seconds. Distance covered = Relative speed * Time = 35 * 12 = 420 meters. Length of the second train = Total distance - Length of the first train = 420 - 150 = 270 meters. Correct Option: d
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