- AEvery 4.8 min
- BEvery 6 min
- CEvery 10 min
- DEvery 12 min
Step-by-Step Solution
Relative speed = 10 km/; one lap (2 km) is gained every min. (4.8 min uses 20 + 30.)
Answer: D) Every 12 min
Two cyclists ride round a 2 km circular track in the same direction at 20 km/h and 30 km/h, starting together. How often does the faster one lap the slower?
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