There is a regular bus service between towns *A* and *B*, with a bus leaving towns *A* and *B* every *T* minutes. A cyclist moving with a speed of 20 [km/h] in the direction *A* to *B* notices that a bus goes past him every 18 minutes in the direction of him and every 6 minutes in the direction opposite direction. What is the period *T* (in minutes) of bus service?

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