Three cows

Algebra Level 2

A farmer has three cows, A, B and C

Cow A has a good appetite and always finishes the grass provided in 20 minutes.

Cow B eats in a moderate speed and always finishes the grass provided in 30 minutes.

Cow C is extremely lazy and always finishes the grass provided in an hour.

Given such information, if they all eat together, how much time do they need? Give your answer in minutes.

Details and Assumptions:

The farmer provides the same amount of grass every time.

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