Pipes a and b can fill a tank

Asked by admin @ in Math viewed by 543 People

pipes a and b can fill a tank in 5 and 6 hours respectively. Pipe c can empty it in 12 hours. The tank is half fill. All 3 pipes are in operation simultaneously. After how much time will the tank be full

Answered by admin @


(1/5)+(1/6)-(1/12) = (12+10-5)/60
17/60
by doing reciprocal we get
60/17 hours

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