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Direct Variation
Inverse Variation
Work Problems
Working with Radical Expressions
Rationalizing the Denominator
Solving Rational Expressions
  WORK PROBLEMS
Now, let’s try a more advanced problem.

An inlet pipe can fill up a pool in 18 hours. The drain pipe can empty the pool in 30 hours. If the drain pipe is accidentally opened when the pool is half filled, how long will it take to fill the pool?

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Pipes
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