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Trains A and B are travelling at x km/hr...

Trains A and B are travelling at x km/hr and (x + 36) km/hr respectively. Train B crosses train A when running in the same direction in `31(1)/(2)` seconds. Find the sum of speed of both the trains if they pass each other in 9 seconds while running in opposite direction

A

A)126 km/hr

B

B)120 km/hr

C

C)116 km/hr

D

D)136 km/hr

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A
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