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

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