Question
Zoe and Lee have a bicycle race. Zoe cycles at a speed of 14 km/h. Lee cycles at a speed of 21 km/h. If Lee lets Zoe start 30 min before him, how long will Lee take to catch up with Zoe?
3 m

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Zoe and Lee have a bicycle race. Zoe cycles at a speed of 14 km/h. Lee cycles at a speed of 21 km/h. If Lee lets Zoe start 30 min before him, how long will Lee take to catch up with Zoe?