Question

A train 400m long is running at speed of 72 km/hour. how much time will it take to cross a 200m long bridge solution

Answer 1

Length of the train  + Tunnel = 400 + 200 = 600
Train Speed = 72Km/hr
                         = 72 * 5/18
                         = 20

Time taken = 600/20 = 30 sec

Answer 2

Hi !

Total distance = Length of the train  + length of the bridge
                      = 400 + 200 = 600 m

Speed =  72 km/hr  = 72 * 5/18
            = 20 m/s
 
        
Time taken = distance/time
                   = 600/20
                   = 30 sec