A car covers $$AB$$ distance with first one-third at velocity $$v_1$$ m s$$^{-1}$$, second one-third at $$v_2$$ m s$$^{-1}$$ and last one-third at $$v_3$$ m s$$^{-1}$$. If $$v_3 = 3v_1$$, $$v_2 = 2v_1$$ and $$v_1 = 11$$ m s$$^{-1}$$, then the average velocity of the car is ______ m s$$^{-1}$$.

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