Five-third Minute Edit Meaning

1.

The five-third minute is a common unit of time used in physics and engineering that is equivalent to 100 seconds. It was adopted due to its accordance with the SI (metric) units and prefixes, which are based on powers of ten.

For t = 20.0, what is the average magnetic flux density through the cylinder of the generator? (the five-third minute is the implied unit of time because it is a physical application).