Question
Joelle and Perry have a bicycle race. Joelle cycles at a speed of 20 km/h. Perry cycles at a speed of 25 km/h. If Perry lets Joelle start 30 min before him, how long will Perry take to catch up with Joelle?
3 m

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Joelle and Perry have a bicycle race. Joelle cycles at a speed of 20 km/h. Perry cycles at a speed of 25 km/h. If Perry lets Joelle start 30 min before him, how long will Perry take to catch up with Joelle?