Usain Bolt runs 100 meters in less than 10 seconds. His average speed is less than 10meters/secdad less than 10second/meter more than 10meters/second more than 10seconds/meter

To determine Usain Bolt's average speed, we need to use the formula for speed:<br /><br />\[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} \]<br /><br />Given:<br />- Distance = 100 meters<br />- Time = less than 10 seconds<br /><br />Since the time taken is less than 10 seconds, we can express it as \( t < 10 \) seconds.<br /><br />Now, let's calculate the average speed:<br /><br />\[ \text{Speed} = \frac{100 \text{ meters}}{t \text{ seconds}} \]<br /><br />Since \( t < 10 \) seconds, the speed will be:<br /><br />\[ \text{Speed} > \frac{100 \text{ meters}}{10 \text{ seconds}} = 10 \text{ meters/second} \]<br /><br />Therefore, Usain Bolt's average speed is more than 10 meters/second.<br /><br />So, the correct answer is:<br />more than $10meters/second$