exam Maths Puzzle Numerical Ability

Debbie traveled by boat 4 miles upstream to fish in her favorite spot. Because of the 5-mph current, it took her 40 minutes longer to get there than to return. How fast will her boat go in still water? (Round the answer to one decimal place.)

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I really need help with this question: find the roots of the polynomial equation, and state the multiplicity of each root P(x)=-1/2(x+3)(x+4)^3(2x+1) x squared times the cube root of (1/x^15 y^8)