alleryA takes 10 days and B takes 15 days. Working on alternate days, A first, they complete the job in
A12 days
B11 days
C10 days
D15 days
Answer & Solution
Correct answer: A. 12 days
Each two-day cycle does 1/10 + 1/15 = 1/6, so 6 cycles take 12 days.
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