Answer
105 sec = $1\frac{3}{4}min$
Work Step by Step
Use unit fractions to convert.
$105sec\times\frac{1min}{60sec}=\frac{105}{60}min=1\frac{45}{60}min=1\frac{45\div15}{60\div15}min=1\frac{3}{4}min$
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