Question
Two trains of lengths 150 m and 200 m are running in
opposite directions at speeds of 54 km/h and 72 km/h respectively. In how many seconds will they completely cross each other?Solution
Convert speeds to m/s: 54 km/h = 54 × 5/18 = 15 m/s 72 km/h = 72 × 5/18 = 20 m/s Relative speed (opposite directions) = 15 + 20 = 35 m/s Distance to be covered = 150 + 200 = 350 m Time = distance / speed = 350 / 35 = 10 s Answer: 10 seconds.
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