A railway train 100 m long passes over a bridge 400 m long at the rate of 72
Step 1: Given
Length of the train = 100 m.
Length of the bridge =400 m.
total distance needs to be covered S=Length of the train + length of the bridge = 100 m+400 m =500 m.
Speed of train = 72
Step 2: Formula.
Step 3.Calculation of time.
Time = 25 seconds .
Hence, the time taken to cross the bridge = 25 seconds.