Answer
\[\underline{23.2\text{ miles/h}}\] and \[\underline{22.3\text{ miles/h}}\]
Work Step by Step
\[1\text{ mile}=1600\text{ m}\] and \[100\text{ yard}=91.4\text{ m}\,\,\,\left[ \because \,\,1.094\,yard=1\,m \right]\]
So, for 100-meter dash, the speed is calculated as follows:
\[\left( \frac{100\text{ m}}{9.69\text{ s}} \right)\left( \frac{3600\text{ s}}{1\text{ h}} \right)\left( \frac{1\text{ mile}}{1600\text{ m}} \right)=23.2\text{ miles/h}\]
Similarly, for 100-yard dash, the speed is calculated as follows:
\[\left( \frac{100\text{ yard}}{9.21\text{ s}} \right)\left( \frac{\text{91}\text{.4 m}}{100\text{ yard}} \right)\left( \frac{1\text{ mile}}{1600\text{ m}} \right)\left( \frac{3600\text{ s}}{1\text{ h}} \right)=22.3\text{ miles/h}\]
