The ratio between the speeds of two trains is 7:8. If the second train runs 400kms. in 5 hours,the speed of the first train is...............
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ratio of speed of two trians = 7:8
speed of first train = 7x
speed of second train = 8x
speed of second train = 400km per 5hours
= 80km per hour
8x = 80
x = 80/8
x = 10
speed of second train = 7x
= 7×10
= 70
therefore speed of second train = 70km per hour
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