A booster pump can be used for filling as well as for emptying a tank. The capacity of the tank is 2400 m. The emptying capacity of the pump is 10 m per minute more than its filling capacity and the pump needs 8 minutes lesser to empty the tank than it needs to fill it. What is the filling capacity of the pump (in m per minute)? (a) 54 (b) 60 (c) 50 (d) 45 (e) 65