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

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