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

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