Question

If a bus moves 60 kmph it will have 3 hours delay. if it moves 90 kmph it will arrive 1 hour earlier. how many kilometers is this route?

Answer 1

let route distance =x km
and bus actual velocity .=y km/h

x/60=y+3 ----------------(1)

again ,
x/90=y-1. -----------------(2)

solve equations (1) and (2).
x/60 -x/90=4

x(90-60)/60 x 90=4

x=4 x 60 x 90/30=720km

hence ,
route =720 km