Multiple choice

You travel out at an average speed of U. You return at an average speed of V. What is your overall average speed?

  1. 2UV/(U + V)

  2. U2 + V2

  3. (U + V)/2

  4. (U2 + V2)/2
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A Correct answer
Explanation

Average speed for a round trip is the total distance divided by total time. If distance is D, time is D/U + D/V. Average speed = 2D / (D/U + D/V) = 2UV / (U + V).

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