A is twice as quick as B. If B can accomplish a task in 12 days on his alone, the number of days it will take A and B to complete the task jointly is:
A. 4 days
B. 6 days
C. 8 days
D. 18 days
Answer:A
A is twice as quick as B. If B can accomplish a task in 12 days on his alone, the number of days it will take A and B to complete the task jointly is:
A. 4 days B. 6 days C. 8 days D. 18 days
Explanation: The ratio between A and B's working rates is 2 to 1.As a result, the ratio of times taken is 1:2.1/12 of a day's labour for B.As a result, A's 1 day's labour equals 1/6; (2 times B's work)'1 day's work for (A + B) = ( 1/6 + 1/12 ) = 3/12 = 1/4.As a result, A and B can complete the task in four days.