alleryP is three times as efficient as Q, and together they finish in 15 days. P alone needs
A30 days
B20 days
C15 days
D45 days
Answer & Solution
Correct answer: B. 20 days
With rates 3x and x, 4x = 1/15 so x = 1/60, and P's rate 3/60 = 1/20 means 20 days.
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