Sam can fill a certain order in 5 hours while Willy needs 9 hours to do the same job. Working together, how long will it take them to fill the order? b. Rosie can wax her car in 2 hours. When she works together with Hannah, they can wax the car in 45 minutes. How long would it take Hannah to wax the car by herself?

College Algebra
1st Edition
ISBN:9781938168383
Author:Jay Abramson
Publisher:Jay Abramson
Chapter9: Sequences, Probability And Counting Theory
Section: Chapter Questions
Problem 24RE: A ladder has 15 tapered rungs, the lengths of which increase by a common difference. The first rung...
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a. Sam can fill a certain order in 5 hours while Willy needs 9 hours to do the same job. Working together, how long will it take them to fill the order?

b. Rosie can wax her car in 2 hours. When she works together with Hannah, they can wax the car in 45 minutes. How long would it take Hannah to wax the car by herself?

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