6 muncitori-------------------10 zile -------------------420 m
10 muncitori ----------------- 8 zile --------------------X m
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6 munc -------------------------10 zile ------------------420 m
10 munc ------------------------10 zile ------------------ X m
X= 10·420/6= 700 m
10 munc --------------------------10 zile ------------------700 m
10 munc ---------------------------8 zile ----------------------Y m
Y = 8·700/10 =560 m