Walking woman

Reeta walks 5/7 km in 1 hour. How far does she go in 3 1/2 hours?

Correct answer:

s =  2.5 km

Step-by-step explanation:

$$\begin{gathered} v={\displaystyle \frac{5}{7}}\doteq 0.7143\text{ km/h } \\ t=3{\displaystyle \frac{1}{2}}=3+{\displaystyle \frac{1}{2}}={\displaystyle \frac{3\cdot 2+1}{2}}={\displaystyle \frac{7}{2}}=3.5\text{ h } \\ s=v\cdot t=0.7143\cdot 3.5={\displaystyle \frac{5}{2}}\text{ km}=2\frac{1}{2}\text{ km}=2.5\text{ km} \end{gathered}$$

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