exam Maths Puzzle Numerical Ability

-3/2p^2+7p-15,p/2p^2-11p+12,2/p^2+p-20

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Cleaning Sidewalks. Edgar can blow the leaves off the sidewalks around the capitol building in 2 hours using a gasoline-powered blower. Ellen can do the same job in 8 hours using a broom. How long would it take them working together? Please help me solve this equation:found the equation of the line that passes through the pair of points (-1,1),(-4,2)