Question

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 seconds. The speed of the train is

Answer 1

Answer:

50 km/h

Explanation:

Same Direction Means Their Speed Difference

Let, Speed of Train = x m/s

Man's Speed = 5 km/h

                      = 5 * (5/18) m/s

                      = 25/18 m/s

Speed Difference = (x - 25/18) m/s

Time = 10 s

Length = 125 m

Speed=Distance/Time

or, ( x - 25/18) = 125/10

or, (18x - 25)/18 = 25/2

or, 18x = 250

or, x = 250/18 m/s

       = (250/18) *(18/5) km/h

       = 50 km/h

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