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B's 1-day work = 1/200. A's efficiency is 5/3 times that of B. In how many days can A alone complete the work?

1. 100
2. 120
3. 150
4. 170

Correct answer: 120

Solution

B's 1-day work = 1/200 (note: source likely has 1/200, OCR may show 1/250). A = 5/3 × B = 5/3 × 1/200 = 1/120. A alone completes work in 120 days.

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