solving polynomial word problems

if anyone could help with any of these questions, it would really make my day!

**question 1.** When the polynomial *mx^3-3x^2+nx+2 *is divided by x+3, the remainder is -1. When it is divided by x-2, the remainder is -4. determine the values of *m* and *n*.

**question 2.** A rectangular prism has dimensions 10cm by 10cm by 5cm. when each dimension is increased by the same amount, the new volume 1008 cm. what are the dimensions of the new prism?

**question 3. **The distance, *d*, in kilometers, travelled by a plane after *t *hours can be represented by *d(t)=-4t^3+40t^2+500t*, where 0<t<10. how long does the plane take to fly 4088km?