alleryA finishes a task in 10 days and B in 15 days. How many days if they work together?
A5 days
B7 days
C6 days
D8 days
Answer & Solution
Correct answer: C. 6 days
Combined rate = 1/10 + 1/15 = 5/30 = 1/6 work per day. Total time = 6 days.
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