Eight hours

Brigadier Franta ties a sheaf of hay in 20 minutes. Lujza in the same time only a quarter. How many sheaves will they tie together in 8 hours?

Correct answer:

s =  30

Step-by-step explanation:

$$\begin{gathered} f=20\text{ min } \\ l=4\cdot f=4\cdot 20=80\text{ min } \\ t=8\text{ h}\to \text{ min}=8\cdot 60\text{ min}=480\text{ min } \\ s=t\mathrm{/}f+t\mathrm{/}l=480\mathrm{/}20+480\mathrm{/}80=30 \end{gathered}$$

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