Question 1037737
Let {{{ t }}} = the number of minutes
before 11 AM
----------------------
{{{ 4t + 30 + t = 90 }}}
{{{ 5t = 60 }}}
{{{ t = 12 }}}
It is 12 min before 11 AM
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I couldn't figure this out until I drew a 
" time line "
>
9:30  AM- - - - - - - - - - - - - - - - - - - - - - - -  - -  11 AM                                                                                                     
|<-----4t-------->|<----- 30 min---->|<--t min----->                          

<---------------------90 min----------------------- >