in 1 hr the two can build 5ft

jeff in one hour, he could build 75/(x-3)

and kirk can build 75/x

75/x+75/(x-3)=75/5

1/x +1/(x-3)=1/5

the lcm is x(x-3)

(2x-3)/(x(x-3))=1/5

this bring a quadratic equation x^2-3x-10x+15=0

x^2-13x+15=0

x= 11.72 or 1.28

for kirk he will build the waa in 11.72 hours

that is 11 hrs 43 min

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