Gabylovesyou
  • Gabylovesyou
Jannette can repair a refrigerator in 60 minutes. Liza can repair a refrigerator 20 minutes faster. If they work together, how many minutes does it take them to repair the refrigerator? 120 minutes 40 minutes 24 minutes 20 minutes
Mathematics
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SOLVED
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schrodinger
  • schrodinger
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Gabylovesyou
  • Gabylovesyou
@jim_thompson5910
jim_thompson5910
  • jim_thompson5910
`Jannette can repair a refrigerator in 60 minutes. Liza can repair a refrigerator 20 minutes faster` question: how long does it take Liza to repair the fridge if she worked on her own (with no help) ?
jim_thompson5910
  • jim_thompson5910
any ideas @Gabylovesyou ?

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Gabylovesyou
  • Gabylovesyou
60 - 20 ?
jim_thompson5910
  • jim_thompson5910
which is 40 min, yes
jim_thompson5910
  • jim_thompson5910
x = time it takes Jannette to do the job alone (with no help) y = time it takes Liza to do the job alone (with no help) z = time it takes to do the job if the two worked together All times (x,y,z) are in minutes In this case, x = 60 min y = 40 min z = unknown \[\Large \frac{1}{x} + \frac{1}{y} = \frac{1}{z}\] \[\Large \frac{1}{60} + \frac{1}{40} = \frac{1}{z}\] solve for z
Gabylovesyou
  • Gabylovesyou
24 ? sorrry wifi is slow...
jim_thompson5910
  • jim_thompson5910
yes, z = 24

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