Question
Hazel and Flynn have a bicycle race. Hazel cycles at a speed of 18 km/h. Flynn cycles at a speed of 21 km/h. If Flynn lets Hazel start 40 min before him, how long will Flynn take to catch up with Hazel?
3 m

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Hazel and Flynn have a bicycle race. Hazel cycles at a speed of 18 km/h. Flynn cycles at a speed of 21 km/h. If Flynn lets Hazel start 40 min before him, how long will Flynn take to catch up with Hazel?