Answer
$16$ hours
Work Step by Step
We are given that $ z=k\dfrac{x}{y}$
Thus, $10=k \times \dfrac{30}{6} \implies 5k=10$
so, $ k=2$
This implies that $ z=2 \times \dfrac{40}{5}$
or, $ z=16$ hours
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 2 - Review Exercises - Page 433: 97
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