Question
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:
Answer: Option D
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Let the speed of two trains be 7x and 8x km/hr.
Then, 8x = \(\left(\frac{400}{4}\right)=100\)
\(x=\left(\frac{100}{8}\right)=12.5\)
Therefore Speed of first train = (7 x 12.5) km/hr = 87.5 km/hr.
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