Stage: 4 Challenge Level: 
How about using the fact that each boat makes a journey to the
first meeting and the distance each travels is related to its
speed? The boats continue without any change of speed, from the
first to the next meeting and again those distances are related to
the speeds, speeds which are still as they were before.
Mathematical reasoning & proof. Ratio. Visualising. smartphone. Other equations. Manipulating algebraic expressions/formulae. Real world. Games. Creating expressions/formulae. Speed.
Published May 1999.
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