a person reach A to B at 25 km/hr,and return from B to A at a speed 20 km /hr . the total time taken by him 9 hr , then find the distance between A and B.

a person reach A to B at 25 km/hr,and return from B to A at a speed 20 km /hr . the total time taken by him 9 hr , then find the distance between A and B.