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

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