Anyone know how to do this

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

What is the multiple zero and multiplicity of f(x) = (x ? 3)(x ? 3)(x + 5)? multiple zero is 3; multiplicity is 2 multiple zero is 5; multiplicity is 1 multiple zero is ? 5; multiplicity is 1 multiple zero is ? 3; multiplicity is 2

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?