alleryA can do a job in 15 days and B in 10 days. A works alone for 5 days, then B joins. B works with A for
A4 days
B6 days
C3 days
D5 days
Answer & Solution
Correct answer: A. 4 days
A does 5/15 = 1/3 alone; the remaining 2/3 at 1/6 per day takes 4 days.
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