Train and walker

Walker passes an hour 5 km. Express train per hour 100 km. Walker went 4 hours. How many minutes took the distance express train?

Correct answer:

t₂ =  12 min

Step-by-step explanation:

$$\begin{gathered} v_1=5\text{ km/h } \\ {v}_2=100\text{ km/h } \\ {t}_1=4\text{ h } \\ s=v_1\cdot t_1=5\cdot 4=20\text{ km } \\ {t}_3=s\mathrm{/}{v}_2=20\mathrm{/}100={\displaystyle \frac{1}{5}}=0.2\text{ h } \\ {t}_2=t_3\cdot 60=0.2\cdot 60\text{ min}=12\text{ min} \end{gathered}$$

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