Marinada '26

[lang=hr] Uvidjevši da nisu dobro začepili odvod, u drugoj kući Harry i Marv odlučili su odvod dobro začepiti krpom. Nažalost, nisu primijetili kako i krpa propušta vodu, ali samo pri većem tlakom. Propuštanje krpe u litrama po satu može se prikazati funkcijom $p(V) = V^2 + 3V$ gdje je V količina vode već prolivene u kući. Uz to kuću pune dvije slavine, prva puni $40 \frac{l}{h}$, a druga $55 \frac{l}{h}$. Koliko litara vode će se proliti u kući? [/lang] [lang=en] After noticing that they didn't plug the drain well last time, in another house Harry and Marv decided to fully plug it using a rag. Unfortunately, they didn't notice that even the rag leaked water, but only under higher pressure. The rate at wich the water is drained through the rag is show by the function $p(V) = V^2 + 3V$ where V is the amount of water already in the house. If two faucets are running, one with a flow of $40 \frac{l}{h}$, and the other of $55 \frac{l}{h}$, how many liters of water will spill into the house? [/lang]