Read the passage given below and solve the questions based on it.
There are 8 days in a week from Sunday to Saturday and another day called Funday on planet North. There are
36 h in a day and each hour has 90 minutes while each minute has 60 s.
Bubby, an inhabitant of the planet North leaves home between 7 am and 8 am and returns between 1 pm and 2 pm to find that the minutes and hours hands have interchanged their positions. How long was bubby out of the house?