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?

Result

s =  30

Solution:

f=20 min l=4⋅ f=4⋅ 20=80 min  t=8 h=8⋅ 60 min=480 min  s=t/f+t/l=480/20+480/80=30f = 20 \ min \ \\ l = 4 \cdot \ f = 4 \cdot \ 20 = 80 \ min \ \\ \ \\ t = 8 \ h = 8 \cdot \ 60 \ min = 480 \ min \ \\ \ \\ s = t/f+t/l = 480/20+480/80 = 30

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