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Two trains start at the same time. Train...

Two trains start at the same time. Train A travelling at an average speed of 54 km goes from city M to city N, while Train goes from city N to city m. The distance between the two cities is 960 km. Find the average speed ( in km/hr) of train B, if both trains cross each other after 8 hours?

A

60

B

76

C

72

D

66

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