Question

a train travels distance of720km at uniform speed if the speed is 12 km per hour less than it would have taken 3hrs more to cover the same distance .find the speed of the train

Answer 1

if a train travels distance of 720 at uniform speed is 12 km per hour =12/3=4

4km per hour

Answer 2

Let the speed be x.
then, time=distance/speed
               =780/x
When speed decreased by 12 km, then new speed of train=(x-12)
And time taken = 720/x-12
ATQ= 720/x-12 - 720/x= 3

Find this your answer will come.