Precalculus (6th Edition)

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

Chapter 1 - Equations and Inequalities - 1.2 Applications and Modeling with Linear Equations - 1.2 Exercises: 1

Answer

At an average rate of 50 mph, it will take the car 8 hours to travel 400 miles.

Work Step by Step

RECALL: For situations involving time (t) , distance (d) and rate (r, sometimes referred to as speed), the formula for time is: $t=\dfrac{d}{r}$ The given situation has: $d=400$ miles $r =50$ mph Use the formula above to obtain: $t=\dfrac{400}{50}=8$ hours
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