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

Answers (1)

Assume first train and second train runs at 7x, 8x km/ hr speed respectively.

Speed of the second train (8x) = 400/4 = 100 km/hr

8x  = 100

x = 12.5 km/hr

Hence speed of the first train (7x) = 7(12.5) = 87.5 km/hr

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