9 cows ate 9 fields of grass in 9 hours.

How long does it take (in hours) for 3 cows to eat 3 fields of grass?

(Assume that all cows eat grass at the same constant rate.)

3
6
9
12

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Relevant wiki: Ratio, Rate and Proportion - Problem SolvingNine cows eat 1 field/hr. So three cows eat 1/3 field/hr. So in nine hours they can eat three fields, and 9:3 = 3:1