Question

Two trains of lengths 80 m and 120 m are moving in same directions with velocity 100 m/s and 120 m/s respectively and engine of faster train is at just after the last boggy of slower train. How much time the second train will take to overtake completely the first train? 10 s 20 s 30 s 40 s

Answer 1

Explanation:

Speed 1 = 72 kmph = 72*5/18 mps = 20 mps. Speed 2 = 54 kmph = 54*5/18 mps = 15 mps. Total Distance = Length 1 + Length 2 = 100+120 = 220 m. Relative speed = Speed 1 - Speed 2 = 20 - 15 = 5 mps.