The ratio between the speeds of two trains is 7 : 8. If the second train cover the 400 kms in 4 hours, then the speed of the first train is ?

A) 80 km/hr

B) 87.5 km/hr

C) 78 km/hr

D) 67 km/hr

Assume that the speed of trains are 7x and 8x km/hr.

8x = 400/4

8x = 100

x = 100/8 = 12.5

so the speed of first train is 7x = 7 * 12.5 = 87.5 km/hr

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