Question
Nora and Seth have a bicycle race. Nora cycles at a speed of 18 km/h. Seth cycles at a speed of 21 km/h. If Seth lets Nora start 40 min before him, how long will Seth take to catch up with Nora?
3 m

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Nora and Seth have a bicycle race. Nora cycles at a speed of 18 km/h. Seth cycles at a speed of 21 km/h. If Seth lets Nora start 40 min before him, how long will Seth take to catch up with Nora?