Question
Kathy and Tim have a bicycle race. Kathy cycles at a speed of 18 km/h. Tim cycles at a speed of 21 km/h. If Tim lets Kathy start 30 min before him, how long will Tim take to catch up with Kathy?
3 m

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Kathy and Tim have a bicycle race. Kathy cycles at a speed of 18 km/h. Tim cycles at a speed of 21 km/h. If Tim lets Kathy start 30 min before him, how long will Tim take to catch up with Kathy?