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  • Brainly User
2015-09-11T10:02:46+08:00

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You may solve elapsed time in terms of fraction, due to minutes involved.

3:45 am is also 03:45 hours = 3  \frac{45minutes}{60minutes}

9:15 pm is also 21:15 hours = 21  \frac{15minutes}{60minutes}

3:45 hours = 3 \frac{3}{4}

21:15 hours = 21 \frac{1}{4}

  20  \frac{5}{4} - 3 \frac{3}{4} = 17 \frac{2}{4}

simplified:  

17  \frac{2}{4}  = 17 \frac{1}{2}

or 17 hours and 30 minutes
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