If you are calculating the time you will arrive at your destination, you would use the Speed, Distance, Time formula.
To enable the use of a calculator we must convert the minutes (or seconds as per the example) to a decimal.
Once calculated, the navigator would not say, “We will arrive in 3.5 hours, so we convert the .5 back into hours (or seconds).
Example 1: Show 30 seconds as a decimal of a minute
Method: divide seconds by 60
30 / 60 = 0.5 minutes
To convert decimal minutes back to seconds, multiply the decimal by 60
0.5 x 60 = 30 seconds
Example 2: Convert 40 seconds to a decimal of a minute
Method: Divide 40 seconds by 60
40 / 60 = 0.66 or 0.7 minutes