book Maths Puzzle Numerical Ability

The power p (in watts) generated by a windmill that has efficiency E is given by the formula P=0.31ED^2V^3, where D is the diameter (in feet) of the windmill blades and V is the wi

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I need help solving this equation:

{{{9x^(-4/3)+32x^(-2/3)=16}}}

At first I tried substituting y for {{{x^(-2/3)}}} so I ended up with {{{9y^2+32y-16=0}}}. I ended with y= 4/ At 9:00 a.m. a truck leaves the truck yard and travels west at a rate of 45 mi/hr. Two hours later, a second truck leaves along the same route, traveling at 55 mi/hr. When will the second truck catch up to the first?

Thank you!!!