Question

Train ‘M’ is travelling with a speed of 72 km/hr and crosses a vertical pole in 5 seconds. Train ‘N’ is 25 metres longer than ‘M’ and travelling with a speed 1/4th less than that of train 'M'. In how much time train N can cross a 175 metres long platform?

A 21 sec
B 22 sec
C 19 sec
D 20 sec
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