book Maths Puzzle Numerical Ability

Simplify: (-3a^2b^-2)^2 / (5a^3)^2

Thanks guys for your help, this is a huge help

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book Other Question

A Metra commuter train leaves Union STation in Chicago at 12 noon. Two hours later, an Amtrak train leaves on the same track, traveling at an average speed that is 50 miles per ho complete the square, and find the roots of the quadratic equation.

x^2 - 2/3x = 0