Question
Irene and Daniel have a bicycle race. Irene cycles at a speed of 15 km/h. Daniel cycles at a speed of 25 km/h. If Daniel lets Irene start 40 min before him, how long will Daniel take to catch up with Irene?
3 m

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Irene and Daniel have a bicycle race. Irene cycles at a speed of 15 km/h. Daniel cycles at a speed of 25 km/h. If Daniel lets Irene start 40 min before him, how long will Daniel take to catch up with Irene?