Albert, Bernard and Cheryl, again

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?

If you think that they will never meet if they continue running in the same way, i.e. \(\infty\). Enter your answer as 999999999999.
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