Question 410571
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Hi
Let x represent the time it would take Peter solo
Question states*** Per hour the Equalizer
 1/5 + 1/6 + 1/x = 1/2
Solving for x  
 6x + 5x + 30 = 15x   |Multiplying thru by 30x so as all denominators = 1
         30 = 4x
         x = 30/4 or 7.5 hrs, time it would take Peter solo

CHECKING our Answer***
   6/30 + 5/30 + 4/30 = 15/30 = 1/2