Anna, Biljana, and Cees stand in a row in a large field. Anna is \(180\) m west of Biljana and Cees is \(450\) m east of Biljana. At the same time, Anna and Cees begin walking. Anna walks north at a constant rate of \(75\) m/min and Cees walks south at a constant rate of \(90\) m/min. Biljana does not move.
After how many minutes of walking will the distance between Biljana and Cees be twice the distance between Anna and Biljana?