Question

how long will a train 120m take to clear a platform 130 m long its speed is 50 km per hours

Answer 1

120 + 130 = 250

250×18/150 = 30 sec

Answer 2

Length of the train=120 m Since the stationary object is not negligible. Therefore, distance travelled= length of the train + length of the platform = 120+130 =250m Since, the speed = 50 km/hr and distance= 250 m or 25/100 km I.e. time= distance / speed = (25/100)/50 = 1/200 hrs or 18 seconds