Jeff takes 5hrs longer to build a fence than it takes Bill. When they work together, it takes them 6hrs. How long would it take Bill to do the job alone?

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Bill does work of the fence per hour = 1/BJeff does 1/J per hour, = 1/(B+5)Together, they do 1/6 per hour.

1/B + 1/(B+5) = 1/6B+5 + B = (1/6)*B*(B+5)12B + 30 = B^2 + 5BB^2 - 7B - 30 = 0(B-10)*(B+3) = 0B = 10 hoursJ = 15 hours

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