Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 1 - Equations and Inequalities - Test - Page 182: 21

Answer

$15\ mph$

Work Step by Step

Step 1. Assume the boat's speed upriver is $x\ mph$, the return speed is then $x+5$ Step 2. As distance is the product of speed and time, we have $1.2x = 0.9(x+5)$ which gives $1.2x=0.9x+4.5\longrightarrow 0.3x=4.5$, thus $x=15\ mph$
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