alleryA takes 6 days less than B alone, and together they finish in 4 days. B alone takes
A8 days
B9 days
C12 days
D10 days
Answer & Solution
Correct answer: C. 12 days
With A = x and B = x + 6, 1/x + 1/(x+6) = 1/4 gives x = 6, so B takes 12 days.
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