Question 350544
Let 8:00 AM be {{{0 }}}and count all time in minutes. 
11:00 would be {{{180}}} ({{{3*60}}}).
Let's say the time now is {{{X}}} minutes after 11:00 AM or {{{180+X}}}. 
Two hours ago it was {{{180+X-120=60+X}}}.
Two hours ago it was also {{{3X+0=3X}}}, "three times as many minutes past 8 a.m."
So then,
{{{3X=60+X}}}
{{{2X=60}}}
{{{X=30}}}
It's now 11:30 AM.
Two hours ago it was 9:30 AM or 90 minutes after 8:00 AM.