Car

The driver of a car is to get to 608 km distant city. From atlas found that 162 km will have to pass through the cities at average speed 48 km/h. Remainder of the journey pass outside the cities at average speed 116 km/h. Calculate how many hours it will take journey.

Correct result:

t =  7.22 h

Solution:

$$\begin{gathered} t=t_1+t_2 \\ {t}_1=s_1\mathrm{/}{v}_1=162\mathrm{/}48=3.38h \\ {t}_2=(s-s_1)\mathrm{/}{v}_2=(608-162)\mathrm{/}116=3.84h \\ t=3.38+3.84=7.22\text{ h} \end{gathered}$$

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