A boy runs 90 metres in. 10 seconds.What is his average speed in km per hour
To calculate the average speed in km per hour, we need to convert the distance from meters to kilometers and the time from seconds to hours.
Distance: 90 meters = 0.09 kilometers (there are 1000 meters in a kilometer).
Time: 10 seconds = 0.00278 hours (there are 3600 seconds in an hour).
Now, divide the distance by the time to calculate average speed:
Average speed = Distance / Time
Average speed = 0.09 km / 0.00278 hours
Average speed ≈ 32.37 km/h
Therefore, the boy's average speed is approximately 32.37 km/h.
To find the average speed in kilometers per hour, we need to convert the distance from meters to kilometers and the time from seconds to hours.
1 kilometer = 1000 meters
1 hour = 60 minutes = 60*60 = 3600 seconds
First, let's convert the distance from meters to kilometers:
Distance in kilometers = 90 meters ÷ 1000 meters/kilometer = 0.09 kilometers
Next, let's convert the time from seconds to hours:
Time in hours = 10 seconds ÷ 3600 seconds/hour = 0.002778 hours
Now, let's calculate the average speed:
Average speed = Distance ÷ Time
Average speed = 0.09 kilometers ÷ 0.002778 hours
To simplify the calculation, we can divide the numerator and denominator by 0.000001:
Average speed = 90,000 kilometers/hour ÷ 2.778 hours
Now, let's calculate the average speed:
Average speed = 90,000 ÷ 2.778
Average speed ≈ 32,375.63 kilometers/hour
Therefore, the boy's average speed is approximately 32,375.63 kilometers per hour.
To calculate the average speed in km per hour, we need to convert the distance (90 meters) to kilometers and the time (10 seconds) to hours.
1. Convert 90 meters to kilometers:
- 1 kilometer = 1000 meters
- Therefore, 90 meters = 90/1000 = 0.09 kilometers
2. Convert 10 seconds to hours:
- 1 hour = 3600 seconds
- Therefore, 10 seconds = 10/3600 ≈ 0.002778 hours
3. Calculate average speed:
- Average Speed = Distance / Time
- Average Speed = 0.09 kilometers / 0.002778 hours
- Average Speed ≈ 32.4 kilometers per hour
Therefore, the boy's average speed is approximately 32.4 kilometers per hour.