Maths challenge Solution from page 5

6th September 2002, 1:00am

The problem can be solved by considering the relative speed of the trains. The speed of approach of the trains is 125 kmh on a 100km track, so they will collide after a time 100125 = 45 hour. Sidney flies at 100 kmh for 45 hour so he flies 80km.

Visit the NRICHwebsite at www.nrich.math.org

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