25 Kilometers per hour is how fast in miles per minute?

Question

25 Kilometers per hour is how fast in miles per minute?

Answer 1

Rather than memorizing every possible conversion factor, I like to just learn just one for each type of measurement.

The official conversion between English and metric dimensions is exactly 2.54 cm/inch. (It's the only one that's exact!)

 

List the conversion factors you'll need.

cm/km = 0.01/1000 = 0.00001  (1 cm is 0.01 m / 1 km is 1000 m)

cm/in = 2.54

in/ft = 12/1 = 12

ft/mi = 5280

min/hr = 60

 

Use the units to decide whether to multiply or divide.

Starting with km, convert to cm:

The conversion factor is cm/km. To convert km to cm we have to divide km by cm/km. So take the reciprocal of the factor as we wrote it and multiply.  That makes the conversion factor 1/0.00001 km/cm.

That's (km/1) * (cm/km) = cm/1 = cm  (Use the units like variable names!) 

 

Values

25/1     * 1/0.00001 * 1/2.54 * 1/12 * 1/5280 * 1/60     =

(25*1*1*1*1*1) / (1 * 0.00001 * 2.54 * 12 * 5280 * 60) = 0.259

Units

km/hr  * cm/km      * in/cm * ft/in  * mi/ft      * hr/min =

(km*cm*in*ft*mi*hr) / (hr*km*cm*in*ft*min) = mi/min

 

Answer 2

25 km in one hour

15.5343 mi in one hour        multiply by 1.609344

0.258905 mi in one minute   divide by 60