a) [tex]( \frac{1}{3} + \frac{5}{6} + \frac{7}{18} ) : 3 \frac{3}{9} = ( \frac{6+ 15 + 7}{18} ) : 3 \frac{3}{9} = \frac{28}{18} : \frac{30}{9} = \frac{28}{18} [/tex] x [tex] \frac{9}{30} [/tex] = [tex] \frac{252}{540} = \frac{7}{15} .[/tex]
b) = 187° 35 min 46 sec.
