There are 60 minutes in an hour, 24 hours in a day, and 365 days in a year (assuming it's not a leap year). So multiply those together:
60 minutes/hour times 24 hours/day times 365 days/year =
525,600 minutes/year.
Notice how the units cancel and leave you with minutes/year. That's how you do conversions.
1/60 minutes in a second
It is 1 hour and 5 minutes.
3 hours and 45 minutes
1 hour and 30 mintues
60 minutes
24,000
24x60x60 do the math
12960
3,679,200 minutes
1,440 minutes.
200 minutes
2.1167 hours.