# 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:

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

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