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


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=30

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