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Question:

How much time is there between 7:45 am today and 3:15 pm tomorrow?

A 31 1/2 hours
Explaination

From 7:45 am today to 7:45 am tomorrow is 24 hours. From 7:45 am tomorrow to 3:15 pm tomorrow is 7 1/2 hours. Total is 31 1/2 hours