Elementary Algebra

by Kaufmann, Jerome; Schwitters, Karen;

Published by Cengage Learning

ISBN 10: 1285194055

ISBN 13: 978-1-28519-405-9

Chapter 7 - Algebraic Fractions - 7.6 - More Fractional Equations and Problem Solving - Problem Set 7.6 - Page 315: 45

Answer

9 hours

Work Step by Step

Mark can do 1/20 = .05 jobs per hour while Phil can do 1/30 = .0333 jobs per hour. Let t be the time they worked together: $1 = .05t + .033t + 5(.05) \\ .75 = .083t \\ t =9$

Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.