Question
Cindy and Bobby have a bicycle race. Cindy cycles at a speed of 14 km/h. Bobby cycles at a speed of 21 km/h. If Bobby lets Cindy start 30 min before him, how long will Bobby take to catch up with Cindy?
3 m

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Cindy and Bobby have a bicycle race. Cindy cycles at a speed of 14 km/h. Bobby cycles at a speed of 21 km/h. If Bobby lets Cindy start 30 min before him, how long will Bobby take to catch up with Cindy?