Answer

wake up hour is : 7:00 am

Time to get ready and walk to school: 1 hour and 30 minutes.

To know the time that you get to school

you need to add 1 hour and 30 minutes to 7:00 am:

7 + 1 + 1/2 ( as 30 minutes is also half an hour (1/2)

8 1/2 am or 8: 30 am.