In PE class, it takes 30 seconds for Xiaoming to run 100 meters, 12 seconds for Xiaojie to run 50 meters, and 8 seconds for Xiaohong to run 30 meters. Which of the three of them is the fastest?

100M / 30s = XM / 1s, so Xiaoming's speed per second is 3.33m/s
When 50M / 12s = XM / 1s, the velocity of Xiaojie is 4.17m/s
If 30m / 8s = XM / 1s, the speed of macro is 3.78m/s
Finally, it is concluded that Xiaojie is the fastest, Xiaohong the second fastest and Xiaoming the slowest

In PE class, it takes 30 seconds for Xiaoming to run 100 meters, 12 seconds for Xiaojie to run 50 meters, and 8 seconds for Xiaohong to run 30 meters. Which of the three of them is the fastest?

In PE class, it takes 30 seconds for Xiaoming to run 100 meters, 12 seconds for Xiaojie to run 50 meters, and 8 seconds for Xiaohong to run 30 meters. Which of the three of them is the fastest?

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