Question

a train 120m long is moving at a speed of 54km/hr.the time taken to pass a bridge of 200m long is

Answer 1

time=distance/speed=0.32/54=.16/27×60=20×0.16/9=16/45×60=64/3=21.3sec

Answer 2

lt = 120m
s = 54* 5/18 = 3 * 5 =15
toata length = lt + bridge l = 120 + 200 = 320
time taken = 320 / 15 = 21.33 sec