Pipe A & B can fill a tank in 20 hours, 30 hours respectively. And pipe C can empty the tank in 40 hours. If all pipes are opened together, how much time will be needed to make tank full?
Ans:
= 1/20+1/30-1/40
= 7/120
= 120/7
= 17 1/7
Ans:
= 1/20+1/30-1/40
= 7/120
= 120/7
= 17 1/7
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