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Solution to: Green Green Grass

Some assumptions:

The following is given:

From this follows:

v1 = 3 × h/180,
v2 = 2 × h/180,
v3 = 1 × h/180,
k = 1 × h/180.

Then holds for the time t that the three animals can graze together: h-t×(v1+v2+v3-k) = 0, so t = h/(v1+v2+v3-k) = h/(3×h/180+2×h/180+1×h/180-1×h/180) = 36. The three animals can graze together for 36 days.

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