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

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