Question
Xuan and Peter have a bicycle race. Xuan cycles at a speed of 20 km/h. Peter cycles at a speed of 25 km/h. If Peter lets Xuan start 30 min before him, how long will Peter take to catch up with Xuan?
3 m

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Xuan and Peter have a bicycle race. Xuan cycles at a speed of 20 km/h. Peter cycles at a speed of 25 km/h. If Peter lets Xuan start 30 min before him, how long will Peter take to catch up with Xuan?