Maths Two pipes A and B can fill a tank in 15 hours and 20 hours respectively while a third pipe C can empty a full tank in 25 hours, initially all the three pipes are opened together after 10 hours pipe C is closed, in how much time will the tank be completely filled?
| Q.201545: Two pipes A and B can fill a tank in 15 hours and 20 hours respectively while a third pipe C can empty a full tank in 25 hours, initially all the three pipes are opened together after 10 hours pipe C is closed, in how much time will the tank be completely filled? |
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