Question

a train running at 80 km/ hr takes 9 second to cross a signal. what is the length of the train.​

Answer 1

Speed = 80 Km/hr = 80 * 5/18 = 200/9 m/s

Time = 9 s

Distance = 200/9 * 9 = 200 m

Length of train = 200m

Answer 2

length of the train = distance covered

distance = speed × time

length = 80 × 9/60×60

converted sec in hour... now calculate it to get your answer