 
 <translate> Part filled by (A + B + C) in 3 minutes = 3(1/30 + 1/20 + 1/10) = 11/20
Part filled by C in 3 minutes = 3/10
Required ratio = 3/10 * 20/11 = 6/11
Thus, the answer is (B). <ibo> Akụkụ jupụtara na (A + B + C) na nkeji 3 = 3 ((1/30 + 1/20 + 1/10) = 11/20 Akụkụ C mejupụtara n'ime nkeji 3 = 3/10 Mkpa ruru = 3/10 * 20/11 = 6/11 N'ihi ya, azịza ya bụ (B). 