Posted by **John** on Tuesday, August 19, 2014 at 10:53pm.

To convert miles per hour to feet per second, which conversion factor would not be used?

a. 1 hr/60 min

b. 1 min/60 sec

c. 5280 ft/1 mi

d. 1 mi/5280 ft

- Algebra -
**John**, Tuesday, August 19, 2014 at 11:31pm
To convert miles per hour to feet per second, which conversion factor would not be used?

a. 1 hr/60 min

b. 1 min/60 sec

c. 5280 ft/1 mi

d. 1 mi/5280 ft

- Math -
**Steve**, Wednesday, August 20, 2014 at 5:57am
mi/hr * 1hr/60min * 1min/60sec * 5280ft/mi

Note that the units all cancel out, leaving ft/sec

Actually all of the factors will work, if you divide by 1mi/5280ft.

However, since one usually wants to multiply, I'd say (d) would not be used.

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