A can do half the work in one day where as B can do it full. B can also do half the work of C in one day. Ratio in their efficiency will be?	Select the correct option
A) 1:2:6  B) 1:2:9  C) 1:2:5  D) 1:2:4  E) 1:3:4
WC of A: B = 1:2   B: C = 1:2   ---------------------   A: B: C = 1:2:4   Answer: 1:2:4
<result>D</result>
A can do half the work in one day where as B can do it full. B can also do half the work of C in one day. Ratio in their efficiency will be?