exam Maths Puzzle Numerical Ability

If tbone can paint a car in 4 hours and walker texas ranger can paint the same car in 6 hours, how long will it take them to paint the car together?

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exam Other Question

Find the equation of the line that goes through the given point and has the given slope. Write the answer in slope-intrecept form.

(-1,-5),-8

this is what I did
-5y=-8x + -1 I got b= -13 which is incorrect can you simplify the following expression for me please: 3x to the second+4x-5-(x to the second-6x+4). Thanks alot