Walking

Lucie can walk about 3 4/5 miles each hour. How far can she walk in 2 hours 45 minutes?

Correct answer:

x =  10.45 mi

Step-by-step explanation:

$$\begin{gathered} v=3+4\mathrm{/}5={\displaystyle \frac{19}{5}}=3.8\text{ mph } \\ t=2+45\mathrm{/}60={\displaystyle \frac{11}{4}}=2.75\text{ h } \\ x=v\cdot t=3.8\cdot 2.75={\displaystyle \frac{209}{20}}={\displaystyle \frac{209}{20}}\text{ mi}=10.45\text{ mi} \end{gathered}$$

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