in 1 hr the two can build 5ft
jeff in one hour, he could build 75/(x-3)
and kirk can build 75/x
the lcm is x(x-3)
this bring a quadratic equation x^2-3x-10x+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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