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

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