College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Prologue: Principles of Problem Solving - Problems: 1

Answer

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Work Step by Step

Because: if the total time for the trip is $\frac{2 mi}{30 mi/h}$, which is equal to $\frac{1mi}{15mi/h}$, and the equation for the total time of the trip is $t_{1} + t_{2} = t_{3}$, then there is no time for the car travelling downhill, since $t_{2} = t_{3} - t_{1} =\frac{1mi}{15mi/h} - \frac{1mi}{15mi/h}$ . Based on the equation: $speed = \frac{distance}{time}$ .
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