Pipe A, B and C can fill a tank separately in 45, 60 and 75 hrs respectively. They started filling the tank together, but pipe B is closed after 5 hours of start and pipe A is closed 2 hrs before the filling of tank. In how many hours will the tank be filled?
1
27(1/32) hrs
2
32(1/27) hrs
3
32 hrs
4
30 hrs