If a car cover a distance of 189km in 4½ hours, what is it average speed? a) 58km/h b) 52km/h c) 48km/h d) 47¼km/h e) 42km/h
The Correct Answer and Explanation is:
To find the average speed, we use the formula:Average speed=Total distanceTotal time\text{Average speed} = \frac{\text{Total distance}}{\text{Total time}}Average speed=Total timeTotal distance
Given:
- Total distance = 189 km
- Total time = 4½ hours = 4.5 hours
Now, let’s calculate the average speed:Average speed=189 km4.5 hours\text{Average speed} = \frac{189 \, \text{km}}{4.5 \, \text{hours}}Average speed=4.5hours189kmAverage speed=42 km/h\text{Average speed} = 42 \, \text{km/h}Average speed=42km/h
So, the correct answer is (e) 42 km/h.
Explanation:
The car covers a distance of 189 kilometers in a total of 4.5 hours. To calculate the average speed, we divide the total distance by the total time it takes. The formula for average speed is straightforward, and it helps determine how fast an object is moving over a given period.
Here, after dividing 189 km by 4.5 hours, we get 42 km/h, which represents the average speed of the car.
This calculation is a simple application of the basic speed formula, where distance is divided by time, and it is essential in determining how efficiently the car travels.
