<PRE><B>Question 338830</B>
20 miles/hour = 20 mi/hr * 5280 ft/mile * (1/60) hr/minute*(1/60) minute/second
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The units cancel --&gt; ft/second
20*5280/(60*60) = 29.333... ft/sec
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PS 60 mph = 88 ft/sec  or 15 mph = 22 ft/sec  If you remember that could save some arithmetic.
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20 mph = 20*22/15 ft/sec
As a check, ft/sec will be a bigger number than mph
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