By writing the 45 minutes as a fraction of an hour. One hour is 60 minutes, so write the 45 over 60 and simplify.
No.
12/45 = 4/15
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45/36 = 5/4
45/75 = 3/5
45/113 is already in its simplest form
45/64 is already in its simplest form
No, you can't, believe
yes: 15 over 37
No, 11/60 is in its simplest form.
Yes and it is: 60/140 = 3/7