SOLUTION: If a runner runs the mile in 4 minutes and 15 seconds. What is his speed in miles/ hours?

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Question 515522: If a runner runs the mile in 4 minutes and 15 seconds. What is his speed in miles/ hours?
Answer by drcole(72) About Me  (Show Source):
You can put this solution on YOUR website!
Our runner ran a mile in 4 minutes and 15 seconds. To figure out his speed in miles per hour, we first need to convert 4 minutes and 15 seconds into hours. There are 60 seconds in a minute, so 15 seconds is:
15%2F60+=+0.25 minutes
So 4 minutes and 15 seconds is 4.25 minutes. There are 60 minutes in an hour, so 4.25 minutes is:
4.25%2F60 hours, or, to the nearest ten thousandth, 0.0708 hours.
So the runner ran 1 mile in 4.25%2F60 hours. This gives us a speed of:
%281%29%2F%28%284.25%29%2F%2860%29%29+=+60%2F4.25 mph, or, to the nearest hundredth, 14.12 mph.