 <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). <yor> Apá tí ó kún fún (A + B + C) ní ìṣẹ́jú mẹ́ta = 3(1/30 + 1/20 + 1/10) = 11/20 Apá tí C fi kún un ní ìṣẹ́jú mẹ́ta = 3/10 Ìfiwéra tí a nílò = 3/10 * 20/11 = 6/11 Nítorí náà, ìdáhùn náà ni (B). 