hey could anyone help and also provide an explanation/working out? thanks a lot !

Answer:
find the volume of cone and then form the following equation
volume of cone=1/3 x base area x height
volume of cuboid= base area x height
The volume of water will be equal in both therefore u can easily form an equation.
1/3Xπ3²X10= 5X3Xh
then solve for h