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

A. 83.5 km/hr

B. 84.5 km/hr

C. 86.5 km/hr

D. 87.5 km/hr

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Correct Answer : D.


Let the speeds of two trains be 7X and 8X km/hr.
8X=4004
⇒X=12.5Km/hr
So speed of first train is 12.5*7 = 87.5 km/hr

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