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

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