Doug biked

Doug biked 5 1/4 miles in 3/4 of an hour. What is his average speed?

Correct answer:

a =  7 mil/h

Step-by-step explanation:

$$\begin{gathered} s=5+{\displaystyle \frac{1}{4}}={\displaystyle \frac{21}{4}}=5.25\text{ mil } \\ t=3\mathrm{/}4={\displaystyle \frac{3}{4}}=0.75\text{ h } \\ a=s\mathrm{/}t=5.25\mathrm{/}0.75=7\text{ mil/h} \end{gathered}$$

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