SOLUTION: Two pipes are filling a pool. one of them can fill the pool alone in 18hrs. The other can fill the pool alone in 12hrs. How long will it take them working together to fill the pool

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Question 372049: Two pipes are filling a pool. one of them can fill the pool alone in 18hrs. The other can fill the pool alone in 12hrs. How long will it take them working together to fill the pool?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi,

Let x represent the time it takes to fill the pool together

per Hour is the Equalizer

1/18 + 1/12 = 1/x   Multiplying each term by 36x so as all denomnators = 1

2x + 3x = 36

5x = 36

x = 7.2 hrs Or 7hr 12min is the time it takes to fill the pool together



checking our answer

2/36 + 3/36 = 5/36 =  1/(72/10) = 10/72 = 5/36