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How many seconds will it take for a car that is traveling at a constant rate of 45 miles per hour to travel a distance of 220 yards? (1 mile = 1,760 yards)
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45mile/hour={45X1760yard(即1 mile)}/3600 second (即1 hour)=22 yard/second
so, 220/22=10 second
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题目信息1m39s
平均耗时
89.3%
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