An airport runway repair team completes work in 15 days. Due to heavy rains, their efficiency drops by 40%. How many extra days are needed?
Correct answer: C. 10
- A. 6
- B. 8
- C. 10
- D. 12
Explanation
The team originally completes the work in 15 days. With a 40% drop in efficiency, they function at 60% of their original efficiency. The new time to complete the work is 15 days divided by 0.6, resulting in 25 days. This means they need an additional 10 days beyond the original schedule. Therefore, Option C is correct. Options A, B, and D stem from incorrect calculations or assumptions about the adjusted time needed.
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