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

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