Question
Tina and Oliver have a bicycle race. Tina cycles at a speed of 15 km/h. Oliver cycles at a speed of 20 km/h. If Oliver lets Tina start 40 min before him, how long will Oliver take to catch up with Tina?
3 m

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Tina and Oliver have a bicycle race. Tina cycles at a speed of 15 km/h. Oliver cycles at a speed of 20 km/h. If Oliver lets Tina start 40 min before him, how long will Oliver take to catch up with Tina?