Question
Opal and Carl have a bicycle race. Opal cycles at a speed of 20 km/h. Carl cycles at a speed of 25 km/h. If Carl lets Opal start 30 min before him, how long will Carl take to catch up with Opal?
3 m

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Opal and Carl have a bicycle race. Opal cycles at a speed of 20 km/h. Carl cycles at a speed of 25 km/h. If Carl lets Opal start 30 min before him, how long will Carl take to catch up with Opal?