Stage: 3 Challenge Level: 
A bus route has a total duration of $40$
minutes.
Every $10$ minutes, two buses set out, one from each end.
How many buses will one bus meet on its way from one end to the other end?
See Crossing the Atlantic for a similar problem.Visualising. Working systematically. Cubes. Interactivities. Generalising. smartphone. Mathematical reasoning & proof. Mathematical modelling. Time. Squares.
Published October 2004.
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