Question

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 ?​

Answer 1

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