# A simple speed.

A car moves on road AB in $$\displaystyle t_1$$ time with average speed $$\displaystyle v_1=30 km/h$$.

Then it moves on road BC in $$\displaystyle t_2$$ time with average speed $$\displaystyle v_2=20 km/h$$.

Calculate the average speed of the car in the entire road AC in $$\displaystyle km/h$$, known that $$\displaystyle t_1=t_2$$

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