Two Inlet pipes A and B fill a tank in 30 & 45 Minutes & Outlet pipe C empty’s the tank in 60 Minutes. All pipes opened together after 10 minutes close the pipe C, the tank will be filled in how many minutes
Three inlet pipes A, B, &C fill a tank in 10, 20, and 30 Hr. If All Pipes are open together after 4 hours closed pipe A. Then after 2 hours closed the pipe B. The Rest work will be done by C. Then after how many hours tank will be filled.