Working together A and B can do a job in 40 days, B and C in 36 days, and all three together in 24 days. In how many days can B alone do the job?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 90
(1/a) + (1/b) + (1/c) = 1/24
Given,
(1/b) + (1/c) = 1/36
(1/a) + (1/36) = 1/24
1/a = 1/72
a = 72 days
1/b = (1/40) - (1/72)
1/b = 4/360 = 1/90
b = 90 days