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

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