Question
Eva and Dylan have a bicycle race. Eva cycles at a speed of 18 km/h. Dylan cycles at a speed of 21 km/h. If Dylan lets Eva start 30 min before him, how long will Dylan take to catch up with Eva?
3 m

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Eva and Dylan have a bicycle race. Eva cycles at a speed of 18 km/h. Dylan cycles at a speed of 21 km/h. If Dylan lets Eva start 30 min before him, how long will Dylan take to catch up with Eva?