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

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