Two persons A and B complete a task in 15 days, when they work together. Person A completes the task in 20 days if he works alone. How many days will B take…
Two persons A and B complete a task in 15 days, when they work together. Person A completes the task in 20 days if he works alone. How many days will B take to finish the task alone?
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Correct answer: (C) 60 days
Explanation
B's one-day work = 1/15 − 1/20 = (4 − 3)/60 = 1/60, so B alone takes 60 days.