 
<translate> Sashin da aka cika ta (A + B + C) a cikin minti 3 = 3 ((1/30 + 1/20 + 1/10) = 11/20 Sashin da C ya cika a cikin minti 3 = 3/10 Matsakaicin da ake buƙata = 3/10 * 20/11 = 6/11 Saboda haka, amsar ita ce (B). <eng> 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). 