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A train 240 m long passes a bridge 120 m long in 24 sec. Find the speed with which the train in moving?

45 km/hr.
54 km/hr.
36 km/hr.
42 km/hr.

Correct Answer: 54 km/hr.

Explanation:

Required speed = (240 + 120) / 24 = 15 m/sec
= 15 x (18/5) km/hr = 54 km/hr

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