book Maths Puzzle Numerical Ability

A man row a boat 24 km upstream in 3 hours and returns downstream in 1.5 hour.

(a) Find the speed of the stream
(b) Find the speed of the boat in still water

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book Other Question

I have the following problem. I've tried working it. Am I correct?
ya^2-yb^2+xb^2-xa^2
y(a^2-b^2)+ x(b^2-a^2)
y(a+b)(a-b)+ x(b+a)(b-a)
(a+b)* (y(a-b)+ x(b-a))
-(a+b)(a-b)(y+ examples and soluton of word application of quadratic function.