4 hours = 240 minutes.
39/240
reduces to
13/80
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39/52
the answer is 39/100. It cannot be simplified more further.
Expressed as a proper fraction in its simplest form, 0.312 is equal to 39/125 or thirty-nine one hundred and twenty-fifths.
78/100 or 39/50
If there are no numbers after the 9 it is rational