Question
Rachel and Fred have a bicycle race. Rachel cycles at a speed of 18 km/h. Fred cycles at a speed of 21 km/h. If Fred lets Rachel start 50 min before him, how long will Fred take to catch up with Rachel?
3 m

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Rachel and Fred have a bicycle race. Rachel cycles at a speed of 18 km/h. Fred cycles at a speed of 21 km/h. If Fred lets Rachel start 50 min before him, how long will Fred take to catch up with Rachel?