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Q. 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 ?
Explanation by: Neha Sharma
Let the speeds of two trains be 7X and 8X km/hr. 8x = 400/4 => x= 12.5 km/hrX=4004=>X=12.5Km/hr So speed of first train is 12.5*7 = 87.5 km/hr
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