The ratio between the speeds of two trains is 7 8 If the second train runs 400 kms in 4 hours ...........

Quantitative Aptitude (CHSL) Time & distance

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 ?

70 km/hr

75 km/hr

84 km/hr

87.5 km/hr

Let the speeds of two trains be 7x and 8x respectively.

The Speed of 2nd train = Distance/Time = 400/4 = 100 km/hr

Means 8x = 100 km/hr => x = 12.5Km/hr

So speed of first train is 7 * 12.5 = 87.5 km/hr

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