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Math-Magic Home -> Number Sense Forum -> Number Sense Forum -> Feet/Second to MPH
Post Info TOPIC: Feet/Second to MPH
vvr1590


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Feet/Second to MPH
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This was on a test I just took:


6.6 feet per second = how many miles per hour?


How would you do it?


Vinay



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Vinay Ramasesh
sharpobject


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5280 ft=1 mile
and
3600 sec=1 hour

So you would divide by (5280/3600). As it turns out, that simplifies to (22/15), which now seems a good number to memorize. Dividing by it is the same as multiplying by (15/22), so get rid of the 22 first to get 0.3. Multiply by 15 and you have 4.5.

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nsfrustratesme


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A good one to remember, if you don't already know, is 60mph=88ft/sec.

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sharpobject


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I would think it simpler to say 15 mph=22 fps, but yeah. I guess I omitted that in the first post. Oops.

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