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Two trains A and B start simultaneously from stations X and Y towards each other respectively. After meeting at apoint between X and Y, train A reaches station Y in 9 hours and train B reaches station X in 4 hours from thetime they have met each other. If the speed of train A is 36 km/hr., what is the speed of train B?

24 km/hr.
54 km/hr.
81 km/hr.
16 km/hr.
Explanation:

The total distance between X & Y is 9 $\times$ 36 km.

Therefore, the speed of B = (9 $\times$ 36)/4 = 81 kmph.

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