Question 1145985
Ker's rate, {{{1/6}}}
Kan's rate, {{{1/x}}}
Ker AND Kan, {{{1/3}}}


{{{1/6+1/x=1/3}}}

-

{{{6x(1/6+1/x)=6x(1/3)}}}

{{{x+6=2x}}}

{{{x=6}}}----------------Kan can also do the one job alone in 6 hours.