A tank is filled by three pipes with different uniform flow rates. When the first two pipes operate together, they fill the tank in the same time as t...
Question
A tank is filled by three pipes with different uniform flow rates. When the first two pipes operate together, they fill the tank in the same time as the third pipe alone. The second pipe can fill the tank 5 hours faster than the first pipe, but 4 hours slower than the third pipe. Find the time (in hours) required by the first pipe alone to fill the tank.