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Answer with Explanation:
Part filled by (A + B + C) in 3 minutes
= 3 (1/30 + 1/20 + 1/10)
= (3 x 11/60) = 11/20 .
Part filled by C in 3 minutes = 3 /10.
Therefore,
Required ratio = (3/10 x 20/11) = 6/11
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