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Question
Write down your school time table of the following:
Morning school working time. 
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Solution
Morning school working time
Morning school class time = 12 hours 40 minutes
Morning school first bell = 9 hours 30 minutes
Morning school working time
= 12 hours 40 minutes – 9 hours 30 minutes
= 3 hours 10 minutes
Hours Minutes
12 40
− 9 30
3 10
3 hours 10 mins
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