A sprinter set a high school record in track and field, running 200.0 m in 21.0s . What is the average speed of the sprinter in kilometers per hour?

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(200 m/21 s) x (1 km/1000 m) x (60 s/min) x (60 min/hr) = ?

To find the average speed of the sprinter in kilometers per hour, we need to convert the distance from meters to kilometers and the time from seconds to hours.

1. To convert 200.0 meters to kilometers, we divide it by 1000 since there are 1000 meters in a kilometer:
200.0 m ÷ 1000 = 0.2 km

2. To convert 21.0 seconds to hours, we divide it by 3600 since there are 3600 seconds in an hour:
21.0 s ÷ 3600 = 0.0058333 h (rounded to 7 decimal places)

3. Now, we can find the average speed by dividing the distance (in kilometers) by the time (in hours):
Average Speed = Distance ÷ Time
Average Speed = 0.2 km ÷ 0.0058333 h = 34.29 km/h (rounded to 2 decimal places)

Therefore, the average speed of the sprinter is 34.29 kilometers per hour.

To find the average speed of the sprinter in kilometers per hour, we can use the formula:

Average Speed = Distance / Time

First, we need to convert the distance from meters to kilometers. Since there are 1000 meters in a kilometer, we divide the distance by 1000:

Distance in kilometers = 200.0 m / 1000 = 0.2 km

Next, we need to convert the time from seconds to hours. Since there are 3600 seconds in an hour, we divide the time by 3600:

Time in hours = 21.0 s / 3600 = 0.0058333 hours

Now we can substitute the values into the formula:

Average Speed = 0.2 km / 0.0058333 hours ≈ 34.29 km/h

Therefore, the average speed of the sprinter is approximately 34.29 kilometers per hour.