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You forgot you have a hair appointment at 12:30. You are at the store getting wrapping stuff. You started at the store at 11. It will take 1 hour and 50 minutes to do everything you need to do. Will you make it to your appointment? Why or why not?
What is no, because 11:00 + 1 hour and 50 minutes is 12:50 and that is 20 minutes later than 12:30.