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Two pipes A and B can fill an empty tank in 3hrs and 5hrs respectively. Pipe C can empty the tank in 4hrs. If the three pipes A, B and C are opened at the same time find how long it will take for the tank to be full.

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1/9 +1/5 -1/4 = 20+12-18/60
17/60
17/60=1hr
1= 1 x 60/17
60/17 = 3.5294118
= 3.529 hrs

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