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 ?
83.5 km/hr
84.5 km/hr
86.5 km/hr
87.5 km/hr
Explanation:
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
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