A and B can do a work in 10 days and 40 days, respectively. How long will it take together to complete the work?
A.12 days
B.15 days
C.8 days✓ Correct
D.20 days
Explanation
A's rate = 1/10 per day, B's rate = 1/40 per day. Combined rate = 1/10 + 1/40 = 4/40 + 1/40 = 5/40 = 1/8 per day. So together they complete the work in 8 days.
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