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To solve this problem, let's define the variables and use the total travel time to determine the distance between City A and City B.

### Problem Breakdown

- **Given:** 
  - Average speed from City A to City B = 60 km/h
  - Average speed from City B back to City A = 80 km/h
  - Total travel time for the round trip = 7 hours

- **To Find:** 
  - Distance between City A and City B, denoted as \( d \).

### Solution

1. **Time Calculation for Each Leg of the Journey:**
   - Time taken from City A to City B = \( \frac{d}{60} \) hours
   - Time taken from City B to City A = \( \frac{d}{80} \) hours

2. **Total Time Equation:**
   - According to the problem, the sum of these times is 7 hours.
   - Therefore:
     \[
     \frac{d}{60} + \frac{d}{80} = 7
     \]

3. **Solve for \( d \):**
   - To simplify, find a common denominator for the fractions. The least common multiple of 60 and 80 is 240.
   - Rewrite the equation:
     \[
     \frac{4d}{240} + \frac{3d}{240} = 7
     \]
     \[
     \frac{7d}{240} = 7
     \]
   - Multiply both sides by 240 to clear the fraction:
     \[
     7d = 1680
     \]
   - Divide both sides by 7:
     \[
     d = 240 \text{ km}
     \]

### Answer:
The distance between City A and City B is **240 km**.

Would you like a more detailed breakdown or have any questions?

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### Related Questions
1. What would be the total travel time if the speeds were reversed (80 km/h going to City B and 60 km/h returning)?
2. If the distance between the cities were doubled, what would be the new total travel time?
3. How would the travel time change if the average speed on both legs were increased by 20%?
4. What if the return speed were 90 km/h instead of 80 km/h? How would that affect the distance calculation?
5. If the car traveled at a constant average speed of 70 km/h for the entire trip, what would be the total time taken?

### Tip:
In problems involving round-trip distances and different speeds, setting up time equations using distance and speed relationships often leads to the solution.

A car travels from City A to City B at an average speed of 60km/h and returns to City A at an average speed of 80km/h. If the total travel time is 7 hours, what is the distance between the two cities?

Learn how to calculate the distance between two cities when a car travels at different speeds on a round trip. This example problem involves speeds of 60 km/h and 80 km/h with a total travel time of 7 hours, suitable for Grade 10 students.

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