Answer
$61.71^{\circ}$
Work Step by Step
We know that
$1"=\frac{1}{3600}^o$
$1'=\frac{1}{60}^o$.
Use a calculator and the conversion factors above to obtain:
$61^{\circ}42'21''\\=61^{\circ}+\left(\frac{42}{60}\right)^{\circ}+\left(\frac{21}{3600}\right)^{\circ}\\=61.7058^{\circ}\\\approx61.71^{\circ}$
