Question

Train A running at a speed of 31 km/hr crosses train B in 20 seconds. Find the speed of train B (in km/hr), if the sum of the length of train A and B is 250 meters and both trains running in the opposite direction.

A 19 km/hr
B 13 km/hr
C 20 km/hr
D 14 km/hr
E 24 km/hr
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