If A alone can do a job in 40 days then, in how many days can B alone do the job if together they can do the job in 8 days?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 10
1/A + 1/B = 1/(A + B)
1/40 + 1/x = 1/8
1/x = 1/8 - 1/40
1/x = 4/40
x = 10 days
Time taken by B to complete the work = 10 days