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World record in the 200-m dash: What was average speed in m/s and mph?

In 1993, the world record in the 200-m dash was 19.72s. What was the average speed in m/s? What was the average speed in mph? please show work!

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mph =? miles per hour or meter per hour. I have done for both
v(avg) = ...

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In a concise explanation, the formulas calculate the answer.

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