Company A can pave 500 feet of sidewalk in 6 hours, and company B can pave 1,000 feet of sidewalk in 8 hours

题目

Company A can pave 500 feet of sidewalk in 6 hours, and company B can pave 1,000 feet of sidewalk in 8 hours. At these rates, how many more yards of sidewalk can company B pave in 9 hours than company A can pave in 9 hours? (3 feet = 1 yard)

选项

125

166

333

375

500

解析

A在6小时内可铺设500英尺 A在1小时内可铺设\(\frac{500}{6}\)英尺 B在8小时内可铺设1000英尺 B在1小时内可铺设\(\frac{1000}{8} = 125\)英尺 A在9小时内可铺设\(\frac{500}{6} \times 9 \div 3 = 250\)码（换算依据：3英尺 = 1码） B在9小时内可铺设\(\frac{125}{3} \times 9 = 375\)码 B比A多铺设的长度 = \(375 - 250 = 125\)码

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