Question
Abi and Michael have a bicycle race. Abi cycles at a speed of 18 km/h. Michael cycles at a speed of 21 km/h. If Michael lets Abi start 30 min before him, how long will Michael take to catch up with Abi?
3 m

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Abi and Michael have a bicycle race. Abi cycles at a speed of 18 km/h. Michael cycles at a speed of 21 km/h. If Michael lets Abi start 30 min before him, how long will Michael take to catch up with Abi?