Question

A and B can separately do a piece of work in 6 days and 12 days respectively. How long will they together take to do the work ?

• A. 8 days
• B. 6 days
• C. 5 days
• D. 4 days

Answer 1

Answer:

D. 4 days

total work = lcm(6, 12) = 12 efficiency of A = 12/6 = 2 efficiency of B = 12/12 = 1 Time taken by both of them to do the work = total work/ total efficiency = 12/(2 + 1) = 4 days