4 and 1/4 hours
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3 and 3/4 hours.
It is: 3 and 1/2 hours
By writing the 45 minutes as a fraction of an hour. One hour is 60 minutes, so write the 45 over 60 and simplify.
To write 7 hours 10 minutes as a fraction, you first convert the 7 hours to minutes, which is 420 minutes (7 hours x 60 minutes). Then, you add the 10 minutes to get a total of 430 minutes. Finally, you can express 7 hours 10 minutes as the fraction 430/60, which simplifies to 43/6 in its lowest terms.
There is no equivalent mixed number.