Hannah can paint a room in 9 hours. destiny can paint the same room in 15 hours. How long does it take for both Hannah and destiny to paint the room if they work together?

Intermediate Algebra
19th Edition
ISBN:9780998625720
Author:Lynn Marecek
Publisher:Lynn Marecek
Chapter7: Rational Expressions And Functions
Section7.5: Solve Applications With Rational Equations
Problem 306E: It takes Sam 4 hours to rake the front lawn while his brother, Dave, can rake the lawn in 2 hours....
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Hannah can paint a room in 9 hours. destiny can paint the same room in 15 hours. How long does it take for both Hannah and destiny to paint the room if they work together? 

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