Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 11 - Rational Expressions and Functions - Cumulative Test Prep - Gridded Response - Page 710: 22


6 minutes

Work Step by Step

Let both mark and lynn clean the office in $T$ minutes together. (Fraction work done in a minute by Karen)+ (Fraction work done in a minute by kim)=1 $\implies (\dfrac{1}{15}+\dfrac{1}{10})T=1$ $\implies (\dfrac{2+3}{30})T=1$ $5T=30$ or, $T=6$ minutes
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