SOLUTION: A pipe can fill a swimming pool in 6 hours. After it has been filling the empty pool for 3 hours, a second pipe is also used, with the result that the pool is filled in another 2 h

Question 125372This question is from textbook algebra: structure and method: book1
: A pipe can fill a swimming pool in 6 hours. After it has been filling the empty pool for 3 hours, a second pipe is also used, with the result that the pool is filled in another 2 hours. How long will it take the second pipe alone to fill the pool. PLEASE HELP!!!!! The answer is 12 hours, but I don't know how to get there. HELP MUCH APPRICIATED!!!!!!!!!!!!!! This question is from textbook algebra: structure and method: book1

Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
it takes 5 hr (3+2) to fill the pool

the first pipe can fill in 6 hr, so it fills 5/6 of the pool

the second pipe fills 1/6 of the pool in 2 hr, so it would take 12 hr (2/(1/6)) to fill alone
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