Lapping on the track

EasyBrainteasers~3m

On a circular track, Lauda completes a lap every $6$ minutes and Hunt every $9$ minutes. Starting together, after how many minutes does Lauda first "lap" Hunt - i.e. gain a full lap on him?

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Lauda gains laps at rate $1/6 - 1/9$ per minute.
That's $1/18$ lap/min; time for a full lap lead is the reciprocal.

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Lapping on the track

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