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I want to do the same problem that I did in the last video, but I want to show you there's multiple

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ways to solve these problems that, should hopefully, give you the right answer, if you do them

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the right way. So, once again, 1 pipe can fill a pool 1/2 times

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faster than a second pipe. If both pipes are open, the pool

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can be filled in 6 hours. If only the slower pipe is open, how

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long will it take to fill the pool. So, as I said

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in the last video whenever you do these problems

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its very important to think in terms of rate,

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the rate that the slower pipe can fill a pool

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and the rate that the faster pipe can fill a pool.

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Now right over here I'm going to define

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that the slower pipe, the slower pipe, can fill a pool in

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R, so its rate is R pools per hour, R pools per hour.

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So if its rate is R pools per hour,

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and R for rate, what is the faster pools rate? The faster pools rate