A plane left 30 minutes late than its scheduled time and in order to reach the destination 1500 km away in time, it had to increase its speed by 100 km/h from the usual speed. Find its usual speed.
Let the usual speed of plane be x Km /hr
Time taken to cover 1500 km with usual speed =
Time taken to cover 1500 km with usual speed (x+100)
=
speed of plane = 500 Km\hr