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'Hello Again' printed from http://nrich.maths.org/
Anne is running around a circular track completing each circuit in
40 seconds. Brenda runs in the opposite direction and meets Anne
every 15 seconds. How long does it take Brenda to run around the
Cathy is running in the same direction as Anne and passes her every
60 seconds. How frequently do Cathy and Brenda pass each other?