A cylindrical vessel of $90 \mathrm{c}\mathrm{m}$ height is filled upto the brim. It has four holes $1$, $2$ , $3$, $4$ which are, respectively, at heights of $20 \mathrm{c}\mathrm{m},\mathrm{ }30 \mathrm{c}\mathrm{m},\mathrm{ }45 \mathrm{c}\mathrm{m}$ and $80 \mathrm{c}\mathrm{m}$ from the horizontal floor $\mathrm{PQ}$. The water falling at the maximum horizontal distance from the vessel comes from