Question
Gillian and Justin have a bicycle race. Gillian cycles at a speed of 15 km/h. Justin cycles at a speed of 21 km/h. If Justin lets Gillian start 48 min before him, how long will Justin take to catch up with Gillian?
3 m

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Gillian and Justin have a bicycle race. Gillian cycles at a speed of 15 km/h. Justin cycles at a speed of 21 km/h. If Justin lets Gillian start 48 min before him, how long will Justin take to catch up with Gillian?