$A$ car travels a distance of $x$ with speed $v_1$ and then the same distance $x$ with speed $v_2$ in the same direction. The average speed of the car is
- A$\frac{v_1 v_2}{2(v_1+v_2)}$
- B$\frac{v_1+v_2}{2}$
- C$\frac{2x}{v_1+v_2}$
- D$\frac{2v_1 v_2}{v_1+v_2}$
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