You can do this problem by multiplying by the reciprocal aka 16/1
so 640 *16 =
One sixteenth divided by 2 is equal to one thirty-second.
16
213.3333
0.0125
23.7037
12.7156
640 minutes divided by 60 minute (one hour)= 11 hours and 7 minutes.
187.5
106.6667
640
640 divided by 1/4 = 160
53.3333