To calculate Missy's average speed, we need to use the formula for speed, which is:

$\text{Speed} = \frac{\text{Distance}}{\text{Time}}$

From the problem:

• Distance = 16 miles
• Time = $1 \frac{1}{4}$ hours, which is equivalent to $1.25$ hours.

Now, let's calculate the speed:

$\text{Speed} = \frac{16 \text{ miles}}{1.25 \text{ hours}}$

I will compute this for you.Missy's average speed was $12.8$ miles per hour.

Would you like more details or have any other questions?

Here are 5 related questions to expand your understanding:

1. How would the average speed change if the time were $1 \frac{1}{2}$ hours instead of $1 \frac{1}{4}$?
2. If Missy rode for 20 miles instead, but at the same average speed, how long would it take her?
3. How do you convert mixed numbers like $1 \frac{1}{4}$ into decimal form?
4. What is the difference between average speed and instantaneous speed?
5. How can we calculate the average speed if Missy rode part of the distance at a different speed?

Tip: When converting mixed numbers to decimals, remember that $1 \frac{1}{4} = 1 + \frac{1}{4} = 1.25$.