20) Two trains A & B of lengths 124m & 200m travel along parallel tracks with velocities
36km/h and 72km/h respectively. Find the time of crossing when trains are moving in the same direction with the train B running behind A
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Answer:
32.4 seconds
Explanation:
total distance = (124 + 200) m = 324 m
velocity of A = 36 km/h = 10 m/s
velocity of B = 72 km/h = 20 m/s
relative velocity = (20-10) m/s = 10 m/s
time of crossing = 324/10 = 32.4 seconds
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