A team lays a 200-meter track in 10 days. Due to machinery failure, work pauses for 2 days. If efficiency drops by 10%, how many extra days are needed?
Correct answer: B. 3
- A. 2
- B. 3
- C. 4
- D. 5
Explanation
Initially, the team works for 8 days before the machinery failure, laying 160 meters of track (since 200 meters in 10 days means 20 meters per day). With 40 meters left and efficiency dropping by 10%, the team now lays 18 meters per day (90% of 20 meters). It will take approximately 2.22 days to complete the remaining work. Since they cannot work a fraction of a day, they would need 3 more days, making Option B correct. Options A, C, and D are incorrect as they either underestimate or overestimate the days needed after the efficiency drop.
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