Question
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
Answer: Option D
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Let the speeds of two trains be 7`x` and 8`x` km/hr.
Then , `8x = 400/4` = 100 `rArr x = (100/8)` = 12.5.
`:.` Speed of first train = (7 x 12.5) km/hr = 87.5 km/hr
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