5. Brandon went to sleep at 21h20 and woke at 06h40. For how long did he sleep?
6. Clementine must be at school at 7:40 a.m. She takes 15 minutes
to walk to
school, 5 minutes to have breakfast, and 50 minutes to shower and get dressed.
What time must Clementine wake up in the morning to be
at school on time?