If A works at 2x speed of B, and together they finish in 12 days, A alone would do it in?
Correct answer: B. 18
- A. 15
- B. 18
- C. 20
- D. 16
Explanation
To solve this, consider the work rates: If B works at 1 unit/day, A works at 2 units/day. Together, their rate is 3 units/day, and they complete the task in 12 days, meaning the total work is 12 × 3 = 36 units. A alone would work at 2 units/day, taking 36 ÷ 2 = 18 days to finish the work. Thus, option B is correct. Options A, C, and D don't fit the calculations given these work rates.
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