seconds
You would use seconds.
The units for the denominator is minutes. Also, since the number in the denominator is to be omitted, the number of seconds (in a minute) are totally irrelevant.
The units in the denominator are minutes. Also, since you are asked to omit the number in the answer, the fact that there are 60 seconds in a minute is irrelevant.
seconds
seconds.AriAesthetic
seconds per minute (secs.min^-1)(secs/min). 480 secs ------------------ = 8 mins 60 secs/min
You place the unit which you are converting from in the denominator.
The units in the denominator are pounds.
ounces
16
20
Because the place value determines the appropriate power of 10 in the denominator.