Correct Answer: Option B
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
So, Required ratio = (3/10 x 20/11) = 6/11.
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