Divide 60 by 420 by working out this way:
60 / 420
= 60 / (60 * 7)
= 1 / 7
The answer is 0.142857142857... (repeating).
60
60
420 divided by 7 = 60
420
60
1 hour = 60 minutes 420 divided by 60 = 7 hours
0.875
7/420 = 1/60
120, 180, 240, 300, 360, 420, 480, 540 +60 . . .
420 / 7 = 60
420 divided by4 = 105
20 divided into 420 = 0.047619047619047616