Ononot — Two pipes P1 and P2 fill a tank. P1 fills it in t1 \in \{2,

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Two pipes $P_1$ and $P_2$ fill a tank. $P_1$ fills it in $t_1 \in \{2, 4\}$ hours and $P_2$ fills it in $t_2 \in \{3, 6\}$ hours. If $t_1, t_2$ are chosen randomly, what is the set of possible times $t = \frac{t_1 t_2}{t_1 + t_2}$ to fill the tank?