There are 60 minutes in every hour. So, if you use fractions 30 minutes would be 30/60, which reduces to 1/2. 20 minutes would be 20/ 60 or 1/3.
3 hours and 45 minutes
240 mintues
150
Just convert the 2 hours to minutes. Then you have the ratio:24 minutes : (the equivalent of 2 hours) Which, if you wish, you can then simplify.
2.1167 hours.
21 hours.
90
there are 11 hours and 40 mintues :)
About 2 hours and 10 mintues or so
1.4 hours = 84 minutes
1,440 minutes.
240 mintues