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

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