#### 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

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Published by
Pearson

ISBN 10:
0-13446-914-3

ISBN 13:
978-0-13446-914-0

$16$ hours

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