A person travels $$x$$ distance with velocity $$v_1$$ and then $$x$$ distance with velocity $$v_2$$ in the same direction. The average velocity of the person is $$v$$, then the relation between $$v$$, $$v_1$$ and $$v_2$$ will be

A

$$v = \frac{v_1 + v_2}{2}$$

B

$$\frac{1}{v} = \frac{1}{v_1} + \frac{1}{v_2}$$

C

$$v = v_1 + v_2$$

D

$$\frac{2}{v} = \frac{1}{v_1} + \frac{1}{v_2}$$