Question 1132400
60% means 0.6.
90% means 0.9.


Inverse variation wanted, so for time x "wasted" and k proportionality constant, score y,


{{{0.6k=1/9}}}

{{{k=1/(0.6*9)}}}

{{{k=1/5.4}}}

{{{k=5/27}}}


Model can be  {{{highlight_green(1/x=k*y)}}}.



If score were 0.9, then
{{{x=1/(k*0.9)}}}


{{{x=27/(5*0.9)}}}


{{{x=27/4.5}}}

{{{x=6}}}----------wasted 6 hours