Answer
$7.2\;$ hours.
Work Step by Step
One lessons $=1.8\;h$
Multiply both sides by $4$.
$4\times$One lessons $=4\times1.8\;h$
Simplify.
$4\times$ lessons $=7.2\;h$.
Hence, it has flown $7.2\;$ hours.
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 4 - Section 4.6 - Multiplication and Division of Measurements - Exercise - Page 188: 38
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