A runner completes the 200-meter dash with a time of 19.80 seconds. What was the runner's average speed in miles per hour?

v = 22.54 mph.

Explanation:

Given that,

Distance moved, d = 200 m

Time, t = 19.8 s

We need to find the runner's average speed.

We know that,

1 mile = 1609.34 m

200 m = 0.124 miles

19.8 seconds = 0.0055 h

So,

Speed = distance/time

So, the runner's average speed is 22.54 mph.

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