Two cyclists ride the same way round a 900 m circular track at 6 m/s and 9 m/s, starting together. After how many seconds does the faster one first lap the slower one?

Question

Accepted Answer

300 s. Same direction: the faster gains 9-6=3 m every second and must gain one full lap of 900 m: 900/3=300 s. (60 s uses the sum of speeds.)

Two cyclists ride the same way round a 900 m circular track at 6 m/s and 9 m/s, starting together. After how many seconds does the faster one first lap the slower one?

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