Two cars start in opposite directions at $40$ and $60$ km/h. Distance after $3$ hours is

Two cars start in opposite directions at $40$ and $60$ km/h. Distance after $3$ hours is
  1. $300$ km
  2. $60$ km
  3. $200$ km
  4. $180$ km

Solution

Combined speed $= 100$. Distance $= 300$ km.

Asked in: IMO

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