If a train travels $360$ km in $4$ hours and the next $300$ km in $5$ hours, its average speed is:

If a train travels $360$ km in $4$ hours and the next $300$ km in $5$ hours, its average speed is:
  1. $66$ km/h
  2. $70$ km/h
  3. $73\dfrac{1}{3}$ km/h
  4. $75$ km/h

Solution

Total distance $= 660$ km, total time $= 9$ hr. Average $= \dfrac{660}{9} = 73\dfrac{1}{3}$ km/h.

Asked in: IMO

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