# First we will convert meters to miles and then find the speed of the runner in miles per hour. 400 m

First we will convert meters to miles and then find the speed of the runner in miles per hour.
400 meters is 0.4 kilometers (1000 meters in 1 kilometer, so 400m / 1000m)
Now let’s convert 0.4 kilometers into miles.
We do this by using the kilometer to miles conversion rate which is 0.621371. (This means that ##”1 kilometer” = “0.621371 miles”##)
So ##”0.4 km” * 0.621371 “miles”/”km” = “0.2485484 miles”##
45.23 seconds is 0.012… hours (there are 3600 seconds in 1 hour, so 45.23s / 3600s/h)
So our speed is 19.782760114967941631660402387796 miles per hour.
Using sig figs we get an answer of 19.78 miles per hour. That is one very fast runner!

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