Question 859173
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Hi,
Let x represent time for both 
 {{{1/11 + 1/16 = 1/x }}}    |Multiplying thru by 11*16x so as all denominators = 1
   16x + 11x = 11*16
        27x = 176 
Re Reply: Set Up is the same concept
{{{1/8 + 1/6 - 1/10 = 1/x}}}
   60x + 80x - 48x = 480
       92x = 480
         x = 480/92= 120/23 = 5 5/23 hr