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

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