Problems on trains

Quantitative Aptitude (SBI-CL)

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A train travelling with 54 km/hr takes 20 second to cross a bridge. Another train 70 meter shorter crosses the same bridge at 36 km/hr. Find the time taken by the second train to cross the bridge?

23 sec

24 sec

25 sec

26 sec

Explanation:

Let L and B are length of train and bridge respectively.
L + B = 54*5/18*20 = 300 meter
L + B – 70 = 36*5/18*t = 230, se we get t = 23 sec

By: Sandeep Dubey

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