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

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