Question

80 min = ___ /b hr (fill the numerator of the improper fraction in its simplest form)

Answer 1

$60min=1hr$
then, $1min=\frac{1}{60}hr$
$80min=\frac{1\times 80}{60}hr$
$=\frac{80}{60}hr$
$=\frac{4}{3}hr$
Hence the fraction expressed as a/b in its simplest form is 4/3.