SOLUTION: a swimming pool can be filling in 11 hours if a water enters through a pipe alone, or in 21 hours if water enters through a hose alone. If water enter through both the pipe and the
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Question 609673: a swimming pool can be filling in 11 hours if a water enters through a pipe alone, or in 21 hours if water enters through a hose alone. If water enter through both the pipe and the hose, how long will it take to fill the pool?
Answer by flame8855(424) (Show Source): You can put this solution on YOUR website!
1/11 + 1/21= 11+21/231 = 32/231
231/32= 7.21
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