Question

After one hour, a car travels a distance of 80 km. So the average speed of the car in the first hour is __ kilometers an hour. After four hours to call travel distance of 270 km. So the average speed of the car after four hours is what?

Answer 1

To find the average speed of the car, you can use the formula:

\[
\text{Average Speed} = \frac{\text{Total Distance}}{\text{Total Time}}
\]

1. **For the first hour:**
- Distance traveled = 80 km
- Time = 1 hour
- Average speed = \( \frac{80 \text{ km}}{1 \text{ hour}} = 80 \text{ km/h} \)

2. **For the first four hours:**
- Total distance traveled = 270 km (for 4 hours)
- Total time = 4 hours
- Average speed = \( \frac{270 \text{ km}}{4 \text{ hours}} = 67.5 \text{ km/h} \)

So, the average speed of the car in the first hour is **80 km/h** and the average speed of the car after four hours is **67.5 km/h**.