SOLUTION: A pool can be filled in 12 hours using a pipe alone, or in 28 hours using a hose alone. if water is entering through both the pipe and the hose. How long will it take to fill the

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Question 237638: A pool can be filled in 12 hours using a pipe alone, or in 28 hours using a hose alone. if water is entering through both the pipe and the hose. How long will it take to fill the pool?
Found 2 solutions by checkley77, nerdybill:
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
12*28/(12+28)=336/40=8.4 hours is required using both pipe & hose to fill the pool.

Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
A pool can be filled in 12 hours using a pipe alone, or in 28 hours using a hose alone. if water is entering through both the pipe and the hose. How long will it take to fill the pool?
.
Let x = time it takes to fill the pool with both pipes
then
x(1/12 + 1/28) = 1
x(28 + 12) = 336
x(40) = 336
x = 8.4 hours
Or, in hours and minutes
x = 8 hours and (.4 * 60) minutes
x = 8 hours and 24 minutes