Question

How 299 become 2 hrs 59 min

Answer 1

I will assume you meant 299 minutes?

so 299 = 4 59/60
that is, 4 hours and 59 minutes

or

4 hours would be 240 minutes
plus another 59 minutes would bring it to a total of 299 minutes

or

5 hours would be 300 minutes. So you are short 1 minute of 5:00 or 4:59