Question
Dana and Tommy have a bicycle race. Dana cycles at a speed of 20 km/h. Tommy cycles at a speed of 25 km/h. If Tommy lets Dana start 30 min before him, how long will Tommy take to catch up with Dana?
3 m

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Dana and Tommy have a bicycle race. Dana cycles at a speed of 20 km/h. Tommy cycles at a speed of 25 km/h. If Tommy lets Dana start 30 min before him, how long will Tommy take to catch up with Dana?