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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