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

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