1/10 of an hour is 1/10 of 60 minutes or 60/10 or 6, so 6 minutes making the bed.
1/5 of an hour is 60/5 or 12, so 12 minutes eating breakfast.
1/2 of an hour is 60/2 or 30 minutes getting ready.
Add it all together 30+12+6 gives you 48 minutes doing all these things in the morning. She is done at 7:48 AM.