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The question is asking for the difference in travel time that Nadin takes for her round trip between city X and city Y, with different speeds on the outbound and return trips.

### Information given:
1. **Outbound trip (X to Y)**:
   - Speed: 120 km/h
   - Time: 2 hours
   - Therefore, the distance can be calculated as:
     \[
     \text{Distance} = \text{Speed} \times \text{Time} = 120 \, \text{km/h} \times 2 \, \text{hours} = 240 \, \text{km}
     \]
2. **Return trip (Y to X)**:
   - Speed: 80 km/h
   - Distance: 240 km (same as the outbound trip)
   - Time taken for the return trip can be calculated using:
     \[
     \text{Time} = \frac{\text{Distance}}{\text{Speed}} = \frac{240 \, \text{km}}{80 \, \text{km/h}} = 3 \, \text{hours}
     \]

### Difference in time:
- Outbound trip time: 2 hours
- Return trip time: 3 hours
- The difference in time is:
  \[
  3 \, \text{hours} - 2 \, \text{hours} = 1 \, \text{hour}
  \]

So the correct answer is **E. 1**.

Would you like further details, or have any other questions?

### Related questions:
1. How do you calculate travel time when distance and speed are known?
2. What is the formula for speed, distance, and time?
3. How would the answer change if the return speed was different?
4. How do round trips with varying speeds affect total travel time?
5. How can you calculate the average speed for a round trip with different speeds?

### Tip:
When calculating time, ensure the distance remains the same for both outbound and return trips if no other information is given about a change in the route.

Nadin melakukan perjalanan dari kota X menuju kota Y dengan kecepatan konstan sebesar 120 km/jam dan membutuhkan waktu 2 jam. Namun, saat kembali dari kota Y ke kota X, kecepatannya turun sebesar 80 km/jam. Berapa perbedaan waktu yang dibutuhkan Nadin untuk perjalanan pergi dan pulang?

This problem involves calculating the difference in travel time for a round trip with varying speeds. Nadin travels from city X to city Y at 120 km/h and returns at 80 km/h. Learn how to calculate the time difference using distance, speed, and time formulas. Suitable for students in Grades 7-9.

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