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Work out all the fixed points - the times when you know the exact whereabouts of everybody, then think about each section separately.
You may want to alter the problem to use easier numbers, eg $30$ miles, $30$mph and $5$mph in order to find suitable methods to use on the main problem.
Walk and Ride
Age 7 to 14
Challenge Level 
Work out all the fixed points - the times when you know the exact whereabouts of everybody, then think about each section separately.
You may want to alter the problem to use easier numbers, eg $30$ miles, $30$mph and $5$mph in order to find suitable methods to use on the main problem.
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