# math

One pipe can fill a swimming pool in 8 hours. Another pipe takes 12 hours. How long will it take to fill the pool if both pipes are used simultaneously?

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1. let t equal the fill time

the pipes each fill a fraction of the pool
the fractions sum to one (the whole pool)

one fraction is t/8
the other is t/12

t/8 + t/12 = 1

24 is the LCD

3t + 2t = 24

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2. 4.8 hrs

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3. Isnt five divided by 24 invalid?

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4. I don't know because I need it for RSM

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