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 result:

s =  30

Solution:

f=20 min l=4⋅ f=4⋅ 20=80 min  t=8 h→min=8⋅ 60 min=480 min  s=t/f+t/l=480/20+480/80=30f=20 \ \text{min} \ \\ l=4 \cdot \ f=4 \cdot \ 20=80 \ \text{min} \ \\ \ \\ t=8 \ h \rightarrow min=8 \cdot \ 60 \ min=480 \ min \ \\ \ \\ s=t/f+t/l=480/20+480/80=30

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