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AT SHAVI'S SCHOOL THE FIRST CLASS STARTS AT 8:30 AM.AND FOURTH CLASS ENDS AT 11:30 AM.THERE ARE FOUR MINUTES BETWEEN CLASSES .EACH CLASS IS SAME LENGTH.HOW LONG IS EACH CLASS?
11:30 - 8:30 = 3 hours
3 hours = 180 minutes
180 minutes - 12 minutes =  168 minutes
168 minutes / 4 = 42  minutes
So the duration of each class = 42 minutes.


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