Question
Risa and Brandon have a bicycle race. Risa cycles at a speed of 16 km/h. Brandon cycles at a speed of 18 km/h. If Brandon lets Risa start 30 min before him, how long will Brandon take to catch up with Risa?
3 m

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Risa and Brandon have a bicycle race. Risa cycles at a speed of 16 km/h. Brandon cycles at a speed of 18 km/h. If Brandon lets Risa start 30 min before him, how long will Brandon take to catch up with Risa?