Question
Two trains of lengths 120 m and 150 m are moving in
opposite directions at speeds of 45 km/h and 30 km/h, respectively. How much time will they take to cross each other completely?Solution
Relative speed = (45 + 30) km/h = 75 km/h = 75 × 1000 / 3600 m/s = 125/6 m/s Total distance = 120 m + 150 m = 270 m Time = 270 / (125/6) = 12.96 ≈ 13 seconds. Correct Option: d
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