Question 277656
Let s=hrs sammy takes and m=hrs martin takes
s=m+5
in 1 hr martin gets 1/m of the job done and sammy gets 1/(m+5) done.
1/m + 1/(m+5) = 1/6
6(m+5)+6m=m(m+5)
6m+30+6m=m^2+5m
m^2-7m-30=0
(m-10)(m+3)=0
m=10 hrs
s=15 hrs
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Ed