Question 386500
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Hi
Let x and 2x represent the solo times for the mechanic and helper respectivly
Question States:  Per hour being Equalizer
 1/x + 1/2x = 1/7 Mulitplying each term by 14x so as all denominators = 1
 14 + 7 = 2x
    21 = 2x
     x = 21/2 = 10.5hrs, mechanics solo time, the helper's 21hr   (2*10.5)

CHECKING our Answer
  1/10.5 + 1/21 = .1429 hr = 1/7