the ratio between the speeds of 2trains is 7:8 if the second train run 400 km in 5 hrs the speed of the first train is ?
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let the common multiple of ratios of speeds of trains is k .
speed of first train is 7k.
speed of second train = 400/5= 80km/hr
8k = 80
k = 10
speed of first train = 7k = 70 km/hr
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