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A car moves from $X$ to $Y$ with a uniform speed $v_1$ and returns to $Y$ with a uniform speed $v_2$ . The average speed for this round trip is

• A
  $\bar v = \frac{{{v_1} + {v_2}}}{2}$
• B
  $\bar v =\sqrt {{v_1}{v_2}} $
• ✓
  $\frac{{2}}{{\bar v}} =\frac{1}{{{v_1}}} + \frac{1}{{{v_2}}}$
• D
  $\frac{{1}}{{\bar v}} =\frac{1}{{{v_1}}} + \frac{1}{{{v_2}}}$