John and Jay run the 220-yard dash ,and Jay wins the race by 10 yards .if Jay runs the race in 30 seconds ,what is the rate of each boy in yards per second?how long would it take John to run the 220-yard dash?
问题描述：
John and Jay run the 220-yard dash ,and Jay wins the race by 10 yards .if Jay runs the race in 30 seconds ,what is the rate of each boy in yards per second?how long would it take John to run the 220-yard dash?
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