If a man runs the 200 meter dash in 10.2 seconds how Many miles per hour is he running?

Answer 1

His average speed is approx 43.9 mph.

Ignoring the fact that the world record for 100m is barely under 10 seconds:

1 hour = 3600 seconds

1609.344 m = 1 mi (exactly) → 1 m = 1/1609.344 mi

Find speed in meters per second:

speed = distance/time = 200 m / 10.2 s = 200/10.2 m/s

Now find out how many meters run in one hour:

→ speed = 200/10.2 m/s x 3600 s/hr = 200/10.2 x 3600 m/hr

Now find out how many miles this represents in one hour:

→ speed = 200/10.2 x 3600 m/hr x 1/1609.344 mi/m = 200/10.2 x 3600/1609.344 mph ≈ 43.9 mph

Answer 2

He is running at 43.9 miles/hour.