Question
Dana and Vincent have a bicycle race. Dana cycles at a speed of 15 km/h. Vincent cycles at a speed of 20 km/h. If Vincent lets Dana start 40 min before him, how long will Vincent take to catch up with Dana?
3 m

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Dana and Vincent have a bicycle race. Dana cycles at a speed of 15 km/h. Vincent cycles at a speed of 20 km/h. If Vincent lets Dana start 40 min before him, how long will Vincent take to catch up with Dana?