book Maths Puzzle Numerical Ability

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?

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multiply:

5x+5/x-2*2x^2-8x+8/x^2-1 GRAPH {{{y^2+(x+1)^2-2x^2=100}}}