Book Maths Puzzle Time and Work

How do you arrive at the answer with this as the question?

Keith can complete a job in 3hrs by himself. Karen can complete it in 4hours, and Kyle can complete in in 6hrs. How

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Book Other Question

Explain graphically
3x+15y=24
3x-8y =24
Plot points on graph and draw a straight line passing through that two points
How do I factor 6x^2-7x-4?