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A tank can either be filled in 12 hours by Pipe A or in 8 hours by Pipe B How long will it take both pipes woorking together to fill the tank?
Angelvenia
Pipe A fills 1/12 of the tank per hour, and Pipe B fills 1/8 of the tank per hour. Together, they fill 1/12+1/8 of the tank per hour.
1/12+1/8=(1*8)/(12*8)+(1*12)/(12*8)=(8+12)/(12*8)=20/96=5/24 of the tank per hour
So, it would take 1/(5/24)=24/5 = 4.8 hours to fill the tank with both pipes.
Wiki User
∙ 14y ago
hardit singh
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