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Australian AMC 2019 - Senior Question 9

AMC AUSTRALIA · Australian AMC 2019 - Senior

Question 9

Mia walks at 1.5 metres per second. Her friend Crystal walks at 2 metres per second. They walk in opposite directions around their favourite bush track, starting together from the same point. They first meet again after 20 minutes.
How long, in kilometres, is the track?
  1. 3.5
  2. 4.2
  3. 6
  4. 7
  5. 8.4