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

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