alleryA, B and C can complete a work alone in 30, 20 and 60 days. All three together need
A12 days
B8 days
C10 days
D15 days
Answer & Solution
Correct answer: C. 10 days
Daily work is (2 + 3 + 1)/60 = 6/60 = 1/10 of the job, so 10 days.
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