Question
Gwen and Simon have a bicycle race. Gwen cycles at a speed of 18 km/h. Simon cycles at a speed of 21 km/h. If Simon lets Gwen start 30 min before him, how long will Simon take to catch up with Gwen?
3 m

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Gwen and Simon have a bicycle race. Gwen cycles at a speed of 18 km/h. Simon cycles at a speed of 21 km/h. If Simon lets Gwen start 30 min before him, how long will Simon take to catch up with Gwen?