A train 125 m long passes a man, running at 5 km/hr in the same direction in which the train is going, in 10

Speed of the train relative to man = 125/10 m/sec


= 25/2 m/sec.


= 25/2 x 18/5 km/hr


= 45 km/hr.

Let the speed of the train be x km/hr. Then, relative speed = (x - 5) km/hr.

x - 5 = 45 x = 50 km/hr.

Assuming it is 10 s and you want the speed of the train.
V = speed of train relative to man
125 m in 10 s
1 km in 80 s
V = 3600/80 = 45 km /hour
Speed of train = 50 km/hour

... seconds. How fast is the train travelling?

Please confirm this is the end of the question.

but what is the question ? i dont get it.