If a runner completes a 400 m track in 50 seconds, what is his speed in km/h?

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Question: If a runner completes a 400 m track in 50 seconds, what is his speed in km/h?

Options:

Correct Answer: 7.2 km/h

Solution:

Speed = Distance / Time = 400 m / 50 s = 8 m/s = 8 * 18/5 = 28.8 km/h.

If a runner completes a 400 m track in 50 seconds, what is his speed in km/h?

If a runner completes a 400 m track in 50 seconds, what is his speed in km/h?

Step 1: Identify the distance the runner completed, which is 400 meters.
Step 2: Identify the time it took the runner to complete the distance, which is 50 seconds.
Step 3: Use the formula for speed, which is Speed = Distance / Time.
Step 4: Plug in the values: Speed = 400 meters / 50 seconds.
Step 5: Calculate the speed in meters per second: 400 / 50 = 8 m/s.
Step 6: Convert the speed from meters per second to kilometers per hour using the conversion factor (1 m/s = 18/5 km/h).
Step 7: Multiply the speed in m/s by 18/5: 8 m/s * (18/5) = 28.8 km/h.

Speed Calculation – Understanding how to calculate speed using the formula Speed = Distance / Time.
Unit Conversion – Converting speed from meters per second (m/s) to kilometers per hour (km/h) using the conversion factor.