Question

 The ratio between speed of two trains is 4 : 5. If the second train runs 600 km in 5 h, what is the speed of the first train?

Answer 1

let the speed of the trains be 4x and 5x
now
as we know
speed=dist/time
5x=600/5
5x=120
x=24
therefore the speed of the first train is 4*24=96km/hr

hope this helps:p

Answer 2

Ratio of speed of trains is 4:5

Speed of 2nd train - Distance/Time= 600/5 km/hr = 120km/hr

Let the speed of first train be x

A.T.Q-

4 : 5 :: x : 120

As, we know product of mean = product of extremes

Therefore, 4×120 = 5x

or, 5x = 480

or, x = 480/5

or, x = 96 km/hr

Answer) Speed of first train is 96 km/hr