Question
Lucy and Gabriel have a bicycle race. Lucy cycles at a speed of 18 km/h. Gabriel cycles at a speed of 21 km/h. If Gabriel lets Lucy start 50 min before him, how long will Gabriel take to catch up with Lucy?
3 m

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Lucy and Gabriel have a bicycle race. Lucy cycles at a speed of 18 km/h. Gabriel cycles at a speed of 21 km/h. If Gabriel lets Lucy start 50 min before him, how long will Gabriel take to catch up with Lucy?