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Q:

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?

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Let the speeds of two trains be 7X and 8X km/hr.

8X=400/4=>X=12.5Km/hr

So speed of first train is 12.5*7 = 87.5 km/hr

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