Question
Irene and Pierre have a bicycle race. Irene cycles at a speed of 20 km/h. Pierre cycles at a speed of 23 km/h. If Pierre lets Irene start 36 min before him, how long will Pierre take to catch up with Irene?
3 m

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Irene and Pierre have a bicycle race. Irene cycles at a speed of 20 km/h. Pierre cycles at a speed of 23 km/h. If Pierre lets Irene start 36 min before him, how long will Pierre take to catch up with Irene?