"v_{avr}=\\frac{S\/2+S\/2}{t_1+t_2}=\\frac{S\/2+S\/2}{S\/(2v_1)+S\/(2v_2)}=\\frac{v_1v_2}{v_1+v_2}=\\frac{80\\cdot 60}{80+60}=34.3km\/hr"
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