Hello,
We must calculate the volume of water in one hour.
V=15000*PI*0.07²=230,9070600... m^3/h.
Volume of the pond=50*44*.21=462 m^3
Time=462 m^3/ 230.907... m^3/h=2,0008... h≈2 h
The answer is 2.041*10 to the 6th power
6/15. Because you have 6 bananas and all the others are different fruits. All of them together make fifteen in total.
Assuming

. We have Lagrangian

with partial derivatives (set to 0)[/tex]





Solving this system of linear equations yields

and

as the sole critical point, which in turn gives a maximum value of

.