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What is the correct answer?
4
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
Correct Answer :
D. 87.5 km/hr
Let the speeds of two trains be 7X and 8X km/hr.
$8X=\frac{400}{4}$
$\Rightarrow X=12.5Km/hr$
So speed of first train is 12.5*7 = 87.5 km/hr
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