$$15 \frac{29}{30}$$ мин + $$14 \frac{14}{15}$$ мин
- $$14\frac{14}{15} = 14\frac{28}{30}$$
- $$15\frac{29}{30} + 14 \frac{28}{30} = (15 + 14) + (\frac{29}{30} + \frac{28}{30}) = 29 + \frac{57}{30} = 29 + \frac{30 + 27}{30} = 29 + 1 + \frac{27}{30} = 30 + \frac{9}{10} = 30\frac{9}{10}$$
Ответ: $$30\frac{9}{10}$$ мин