An object moves with speed $v_1,v_2$ and $v_3$ along a line segment AB, BC and CD respectively as shown in figure. Where AB = BC and AD = 3AB, then average speed of the object will be:

Question

${{{v_1}{v_2}{v_3}} \over {3({v_1}{v_2} + {v_2}{v_3} + {v_3}{v_1})}}$

${{({v_1} + {v_2} + {v_3})} \over 3}$

${{({v_1} + {v_2} + {v_3})} \over {3{v_1}{v_2}{v_3}}}$

${{3{v_1}{v_2}{v_3}} \over {({v_1}{v_2} + {v_2}{v_3} + {v_3}{v_1})}}$

Solution

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