Two pipes can fill a tank in 20 and 24 min respectively and a waste pipe can empty 3 gallons per min. All the three pipes working together can fill the tank in 15 min. The capacity of the tank in gallons:
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Step-by-step explanation:
It takes Z minutes to empty so
1/20+(1/24)-(1/z)=1/15
Z=40 minutes
Given 3 gallons per min so for 40 minutes 120 gallons
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