Answer
$4$ hours.
Work Step by Step
Let $n$ be the number of hours worked. Then our equation is: $420=240+n\cdot45\\180=45n\\n=4$.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 1, Equations and Inequalities - Chapter Test - Page 65: 29
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