Walking

The boy walked about 8.5 km in an hour. How long will it take to walk a distance of 32 km if he takes two breaks of 30 minutes during the route?

Correct answer:

t =  4.7647 h

Step-by-step explanation:

$$\begin{gathered} s=32\text{km} \\ v=8.5\text{km/h} \\ {p}_1=30\text{min}\to \text{h}=30:60\text{h}=0.5\text{h} \\ {t}_1=s/v=32/8.5=\frac{64}{17}\doteq 3.7647\text{h} \\ {t}_2=2\cdot p_1=2\cdot 0.5=1\text{h} \\ t=t_1+t_2=3.7647+1=4.7647\text{h} \end{gathered}$$

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