A man sitting on a train travelling at the rate of 50 km/hr observes that it takes 9 sec for goods train travelling in the opposite direction to pass him. If the goods train is 187.5m long. Find its speed ?



A man sitting on a train travelling at the rate of 50 km/hr observes that it takes 9 sec for goods train travelling in the opposite direction to pass him. If the goods train is 187.5m long. Find its speed ?

A. 40 km/hr

B. 30 km/hr

C. 24 km/hr

D. 25 km/hr

Answer : C. 24 km/hr


Explanation :

    Let the speed of goods train be x km/hr.
    Then, (50 + x) * ( 5 / 18 ) = 187.5 / 9
    ⇒ x = 25 km/hr.


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