When a certain stretch of highway was rebuilt and straightened, the distance along the stretch was decreased by 20 percent and the speed limit was increased by 25 percent. By what percent was the driving time along this stretch reduced for a person who always drives at the speed limit?
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A16%
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B36%
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C37$$\frac{1}{2}$$%
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D45%
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E56$$\frac{1}{4}$$%
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正确答案: B