Albert, Bernard and Cheryl meet each other after a long time. They meet each other in a room shaped in a form of an equilateral triangle with side 30 \(m\). After seeing each other from a distance along the three corners of the room they become excited. Each person runs in a constant speed 5 \(ms^{-1}\). They run in such a way that Albert runs directly towards Bernard, Bernard towards Cheryl and Cheryl towards Albert.

After how much time in seconds will the three finally meet?

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