A can do 1/3rd the work in one day where as B can do it full. B can also do 1/3rd the work of C in one day. Ratio in their efficiency will be?  Choose the correct choice.
A) 4:3:9  B) 2:3:9  C) 1:3:9  D) 1:3:5  E) 1:2:9
W1:3:9 of A: B = 1:3   B: 1:3:9 = 1:3   ---------------------   A: B: 1:3:9 = 1:3:9   ANSWER:1:3:9
<result>C</result>
A can do 1/3rd the work in one day where as B can do it full. B can also do 1/3rd the work of C in one day. Ratio in their efficiency will be?