Algebra 1

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

Chapter 11 - Rational Expressions and Functions - Chapter Test - Page 707: 20


17 minutes

Work Step by Step

Let both mark and lynn clean the office in $T$ hours together. (Fraction work done in a minute by mark)+ (Fraction work done in a minute by lynn)=1 $\implies (\dfrac{1}{30}+\dfrac{1}{40})T=1$ $\implies (\dfrac{4+3}{120})T=1$ $7T=120$ or, $T=17.142$ hours or, $T \approx 17$ minutes
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