Question

a car travels a certain distance in 5 hrs.if it had travelled 10 km an hour faster,it would have taken one hour less. find the distance.

Answer 1

let s=x,and t=y, D=s/t,xy=x/5 thats equation1,D=10+x/4 thats equation 2 from eq 1and 2 x/5=10+x/4,4x=50+5x,so x=50 Km/hr then y=2 hr ,distance=100 km