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:

1.

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

Answer: Option D

Explanation:

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.

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