# Chapter 1 - Section 1.8 - Multiplication and Division of Fractions - Exercise: 40

$16\frac{1}{4}$ hours

#### Work Step by Step

Each aircraft searched for $3\frac{1}{4}$ hours. Thus, the total number of hours the 5 search planes searched for the missing aircraft is: $\\=5 \times 3\frac{1}{4} \\=5 \times \frac{4(3)+1}{4} \\=5 \times \frac{13}{4} \\=\frac{5(13)}{4} \\=\frac{65}{4} \\=16\frac{1}{4}$

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