book Maths Puzzle Numerical Ability

Formula: 1020 square root of P (1-.01 square root of P)=G
If P is the population in thousands, this formula is the amount of water in gallons per minute the city needs.
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How would I solve the inequality for the equation x - 1/x^2 < 0? I came up with the answer of (0,1). Would this be the correct answer or show me how to work for the correct answer. Which of the following expressions represents the product of 3 less than twice x and 2 more than the quantity 3 times x ?

How would I write this out in a Rational expression?