From a distance-time graph an object covers $120$ km in $2$ hours at uniform speed. Its speed is:

From a distance-time graph an object covers $120$ km in $2$ hours at uniform speed. Its speed is:
  1. $30$ km/h
  2. $40$ km/h
  3. $60$ km/h
  4. $120$ km/h

Solution

Speed $= \dfrac{\text{distance}}{\text{time}} = \dfrac{120}{2} = 60$ km/h.

Asked in: IMO

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