A WORKS TWICE AS FAST AS B. IF B CAN COMPLETE A WORK IN 12 DAYS INDEPENDENTLY, THE NUMBER OF DAYS IN WHICH A AND B CAN TOGETHER FINISH THE WORK IS:
Select
A) 4 DAYS  B) 6 DAYS  C) 8 DAYS  D) 18 DAYS  E) NONE OF THESE
RATIO OF RATES OF WORKING OF A AND B = 2:1. SO, RATIO OF TIME TAKEN = 1:2   A'S 1 DAY'S WORK = 1/6, B'S 1 DAY'S WORK = 1/12   (A+B)'S 1 DAY'S WORK = (1/6+1/12)=3/12=1/4   SO, A AND B TOGETHER CAN FINISH THE WORK IN 4 DAYS.   CORRECT OPTION: 4 DAYS
<result>A</result>
A WORKS TWICE AS FAST AS B. IF B CAN COMPLETE A WORK IN 12 DAYS INDEPENDENTLY, THE NUMBER OF DAYS IN WHICH A AND B CAN TOGETHER FINISH THE WORK IS: