Posted by Giovanna on Monday, December 8, 2008 at 3:53pm.
a model airplane flies 18 feet in 2 seconds. What is the airplane's speed in miles per hour?

algebra 1  Ms. Sue, Monday, December 8, 2008 at 4:40pm
It travels 9 feet per second.
9 * 60 * 60 = 32,400 feet per hour
To find the miles per hour, divide:
32,400 / 5,280 = ? miles per hour

algebra 1  bobpursley, Monday, December 8, 2008 at 4:41pm
long ago I memorized a conversion factor:
60mph=88fps
18/88=x/60 will do it.

algebra 1  bobpursley, Monday, December 8, 2008 at 4:42pm
oops...
9/88=x/60 will do it.

algebra 1  Ms. Sue, Monday, December 8, 2008 at 4:55pm
When I was a kid, my dad was appalled that I didn't know that 5,280 feet = 1 mile. Since we were on a long car trip, I had plenty of time to memorize that number. I still remember it after 60 years. <g>
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