Same trip totals $100$ km in $3$ hours. The average speed for the whole journey is:

Same trip totals $100$ km in $3$ hours. The average speed for the whole journey is:
  1. $30$ km/h
  2. $\dfrac{100}{3}$ km/h
  3. $50$ km/h
  4. $60$ km/h

Solution

Average speed $= \dfrac{\text{total distance}}{\text{total time}} = \dfrac{100}{3}$ km/h $\approx 33.33$ km/h.

Asked in: IMO

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