Cyclist rides $30$ km in $2$ hours, then $20$ km in $1$ hour. Average speed is

Cyclist rides $30$ km in $2$ hours, then $20$ km in $1$ hour. Average speed is
  1. $\dfrac{50}{3}$ km/h
  2. $25$ km/h
  3. $10$ km/h
  4. $30$ km/h

Solution

Total $50$ km in $3$ hours $\Rightarrow$ avg $= \dfrac{50}{3}$ km/h.

Asked in: IMO

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