https://file.aiquickdraw.com/mathbot/file/1737552231309k925ylbt.jpg

To answer **3d**, we need to calculate the **average speed** for the entire journey.

### Step-by-Step Solution:

1. **Formula for Average Speed**:
   \[
   \text{Average Speed} = \frac{\text{Total Distance}}{\text{Total Time}}
   \]

2. **Total Distance**:
   From part **3c**, the total distance traveled is:
   \[
   \text{Total Distance} = 1600 + 3200 + 3200 = 8000 \, \text{m}.
   \]

3. **Total Time**:
   From the graph:
   - Total time is from \( t = 0 \, \text{s} \) to \( t = 160 \, \text{s} \).
   \[
   \text{Total Time} = 160 \, \text{s}.
   \]

4. **Average Speed**:
   Substitute the values:
   \[
   \text{Average Speed} = \frac{8000}{160} = 50 \, \text{m/s}.
   \]

### Final Answer:
The average speed for the journey is:
\[
\boxed{50 \, \text{m/s}}
\]

Let me know if you want further clarification or have any additional questions!

---

### Expanding Questions:
1. How is the concept of average speed different from instantaneous speed?
2. Can you explain why the total distance includes multiple sections?
3. Why is the distance during uniform motion a rectangle on a speed-time graph?
4. How would the calculation change if there was a different acceleration?
5. Can you calculate average velocity for this journey if there was a direction involved?

### Tip:
Always remember, the area under a speed-time graph represents the total distance traveled!

Learn how to calculate the average speed for a journey using a speed-time graph. This detailed explanation covers the area under the graph, total distance calculation, and average speed formula. Perfect for students in Grades 9-10.

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