Question

Two trains X and Y start at the same time in the opposite direction from two points P and Q and arrive at their destinations 100 and 81 hours respectively after their meeting each other. At what speed does the second train Y travel if the first train travels at 108 km/h. 

A 75 km/h
B 105 km/h
C 96 km/h
D 108 km/h
E 120 km/h
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