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A and B together can do a job in 12 days. After working together for 4 days, A leaves. B finishes the remaining work in 16 days. How long does B alone take to do the entire job?
A$24$ days
B$20$ days
C$28$ days
D$18$ days
Answer & Solution
Correct answer: A. $24$ days
A+B in 4 days = 4/12 = 1/3 of work. Remaining 2/3 done by B in 16 days. So B's rate = (2/3)/16 = 1/24 per day. B alone takes 24 days.
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