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Back to 8.9 Use Direct and Inverse Variation

8.9 Exercise 21

Avg difficulty 2.5

The time required to empty a pool varies inversely as the rate of pumping. It took Lucy 2.5 hours to empty her pool using a pump that was rated at 400 gpm (gallons per minute).

  1. ⓐ Write the equation of variation.
  2. ⓑ How long will it take her to empty the pool using a pump rated at 500 gpm?

OpenStax Elementary Algebra 2e, 8.9 Use Direct and Inverse Variation, exercise 21

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Adapted from Elementary Algebra 2e © 2020 Rice University. Licensed under CC BY 4.0. Source: Elementary Algebra 2e. Imported at revision 77a933c.