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A person travelling in a straight line moves with a constant velocity v1 for certain distance 'x' and with a constant velocity v2 for next equal distance. The average velocity v is given by the relation
Detailed Solution
$v_{avg}=\frac{x+x}{\frac{x}{v_1}+\frac{x}{v_2}} \Rightarrow \frac{2}{v}=\frac{1}{v_1}+\frac{1}{v_2}$.