Question

Train A running at a speed of 45 km/hr crosses train B in 30 seconds. Find the speed of train B (in km/hr), if the sum of the length of train A and B is 550 meters and both trains running in the opposite direction.

A 31 km/hr
B 36 km/hr
C 21 km/hr
D 24 km/hr
E 33 km/hr
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