英语数学问题,谢谢!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?谢谢

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英语数学问题,谢谢!JohnandJayrunthe220-yarddash,andJaywinstheraceby10yards.ifJayrunstheracein30seconds,whatis

英语数学问题,谢谢!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?谢谢
英语数学问题,谢谢!
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?谢谢

英语数学问题,谢谢!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?谢谢
jay 7.33 y/s
john 7y/s
31.42 seconds

20S 谢谢

John 和 Jay跑220码冲刺，Jay以10码赢了，如果Jay30秒跑完，求两孩子每秒各跑多少码，John跑220码需多久

Jay30秒跑完220码，即每秒22/3码，John30秒跑了210码，即每秒7码，跑完220码要220/7秒

RATE: V(jay)= 220/30=22/3=7.3 yard/second;
S(john)= 220-10=210 yard so, V(john)=210/30=7 yard/second.
TIME: T(john)= 220/V(john)=220/7=31.4 seconds

yard: 码（等于3英尺或36英寸或0。9144米）

全文意思是John和Jay进行220yard跑，jay以10每秒的速度赢得了比赛。如果Jay跑30秒就赢得了比赛，那么两个男生之间的速度比率是多少？John要用多长时间才能赢得比赛?

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