It looks like you've uploaded an image containing several problems. Let me break down the first one for you:

Problem 20: 270 miles in 6 hours

This is a speed problem, where we need to find the speed in miles per hour (mph).

We use the formula: $\text{Speed} = \frac{\text{Distance}}{\text{Time}}$

Given:

• Distance = 270 miles
• Time = 6 hours

So, the speed is: $\text{Speed} = \frac{270 \, \text{miles}}{6 \, \text{hours}} = 45 \, \text{miles per hour}$

Answer: The speed is 45 mph.

Would you like me to solve the rest of the problems (21–23)? Let me know if you'd like further details on the solution. Here are some related questions that might help you explore more:

1. What is the difference between speed, velocity, and acceleration?
2. How can you calculate average speed over multiple segments of a trip?
3. What is the unit conversion for kilometers per hour to miles per hour?
4. How does time affect the distance traveled when speed is constant?
5. How do you solve for time when you know distance and speed?

Tip: Always make sure the units are consistent when solving problems involving speed or velocity, especially when you are converting between units like miles, kilometers, or hours!