Answer
$4(x+y)$.
Work Step by Step
If $x+y$ is a motorboat's speed (rate) currently, then its distance covered after $4$ hours will be $4(x+y)$.
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 3 - Section 3.2 - Problem Solving and Business Applications Using Systems of Equations - Concept and Vocabulary Check - Page 204: 5
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