A is thrice as efficient as B and is, therefore, able to finish a piece of work 10 days earlier than B. In how many days A and B will finish it together? Choose the correct choice from the following answers:	A) 7/5	B) 2/7	C) 9	D) 1/5	E) 2
Explanation:   WC = 3:1   WT = 1:3   x 3x   1/x â€“ 1/3x = 1/10   x = 20/3   3/20 + 1/20 = 1/5 days.   Answer:1/5
<result>D</result>
A is thrice as efficient as B and is, therefore, able to finish a piece of work 10 days earlier than B. In how many days A and B will finish it together?