A and B can complete a task in 30 days if they work together. They collaborated for 20 days before B departed. A completed the remaining job after another 20 days. How long will it take A to do the task on his own?
A. 40
B. 50
C. 54
D. 60
Answer:D
A and B can complete a task in 30 days if they work together. They collaborated for 20 days before B departed. A completed the remaining job after another 20 days. How long will it take A to do the task on his own?
A. 40 B. 50 C. 54 D. 60
Explanation: 20 days of labour for (A + B) = ( 1/30 x 20 ) = 2/3.Work remaining = ( 1 - 2/3 ) = 1/3,A now completes 1/3 of the task in 20 days.As a result, A will complete the entire project in 20 x 3 = 60 days.