Question
Irene and Mark have a bicycle race. Irene cycles at a speed of 18 km/h. Mark cycles at a speed of 22 km/h. If Mark lets Irene start 40 min before him, how long will Mark take to catch up with Irene?
3 m

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Irene and Mark have a bicycle race. Irene cycles at a speed of 18 km/h. Mark cycles at a speed of 22 km/h. If Mark lets Irene start 40 min before him, how long will Mark take to catch up with Irene?