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Time and Distance - General Aptitude

Q1:

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:

A 70 km/hr

B 75 km/hr

C 84 km/hr

D 87.5 km/hr

ANS:D - 87.5 km/hr

Let the speed of two trains be 7x and 8x km/hr.

Then, 8x = 400 = 100
4
 x = 100 = 12.5
8
 Speed of first train = (7 x 12.5) km/hr = 87.5 km/hr.