Two pipes can separately fill a tank in 3 hours and 4 hours respectively. If they are both used together, how much time will they take to fill the tank.
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Answer:
Pipe # 1 fills tank in 3 hours; 1/3 tank per hour.
Pipe # 2 fills tank in 4 hours; 1/4 tank per hour.
Filling rate with both pipes open = 1/3 + 1/4 per hour.
Convert fill rates to decimals - 1/3 = .33, 1/4 = .25
.33 + .25 = .58 “tank fills per hour”
.58 / 60 = Tank Fills per Minute = TFM
1.0 (full tank) / TFM = minutes to fill the tank = your answer
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