book Maths Puzzle Numerical Ability

multiply:

5x+5/x-2*2x^2-8x+8/x^2-1

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book Other Question

AN ARCHITECT IS DESIGNING A NEW LAKEFRONT COTTAGE. HE MUST CONSIDER THE BUILDING CODES IN THE DESIGN. THE RECTANGULAR LOT ON WHICH THE COTTAGE WILL BE BUILT IS 220 FT LONG AND HA It takes you 6 hours to do a job. It takes a friend 3 hours to do the same job. How long would it take both of you working together to do the job?