Answer
Please see the screenshot for the table.
30 mph in still water
Work Step by Step
$(r-3)/9$ is upstream
$(r+3)/11$ is downstream
$(r-3)/9 = (r+3)/11$
$9*(r+3)=11*(r-3)$
$9r+27 = 11r-33$
$27 = 2r-33$
$60 = 2r$
$60/2 = 2r/2$
$r=30$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 7 - Section 7.6 - Proportions and Problem Solving with Rational Equations - Exercise Set - Page 538: 26
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