You can put this solution on YOUR website! Break down each segment into fractions of the main unit of measurement then add.
Example, if you want 2 hrs 45 minutes as fraction of a day,
There are 24 hours in one day so 2 hours would be,
2 hours is 1/12 of a day.
.
.
There are 60 minutes in 1 hour so,
45 minutes is 1/32 of a day.
Adding,
So 2 hr 45 minutes is 11/96 of a day.