exam Maths Puzzle Numerical Ability

Please help...
Reduce the expression to the lowest term:
5a-10b over 4b^2 - a^2

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exam Other Question

Rita rows 12 km upstream and 12 km downstream in 3 hours. The speed of her boat in still water is 9 km/hr. Find the speed of the stream.

*note* I really would like some help as to how to setup this question. Thank you! can you please help me solving the problem...multiply the following fractions...

2x^2 - x - 3/3x^2 + 7x + 4 * 3x^2 - 11x - 20/4x^2 - 9