3) 3 + 2

1. Convert mixed numbers to improper fractions: $$3\frac{13}{15} = \frac{58}{15}$$, $$2\frac{13}{16} = \frac{45}{16}$$.
2. Find a common denominator (240): $$\frac{58}{15} = \frac{58 \times 16}{15 \times 16} = \frac{928}{240}$$, $$\frac{45}{16} = \frac{45 \times 15}{16 \times 15} = \frac{675}{240}$$.
3. Add the fractions: $$\frac{928}{240} + \frac{675}{240} = \frac{1603}{240} = 6\frac{163}{240}$$.