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If the flow into a reservoir is 15 cubic feet per second, how long will it take to fill a 1,000,000 gallon reservoir? (1 cubic foot = 7.48 gallons

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\begin{gathered} \text{first we have to change the units to gallons, } \\ \text{given that 1 ft}^3=7.48gallons\text{ we have that} \\ 15ft^3=7.48\cdot15gallons=112.2\text{ gallons} \\ so\text{ the time that it would be take to fill that is equal to } \\ (1000000)/(112.2)=8912.7\text{ sec = 148.6min or 2.47 hours} \end{gathered}

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