anonymous
  • anonymous
It takes 1.5hours for Tim to mom the lawn. Linda can mow the same lawn in 2hours. Approximately how will it take John and Linda, work together, to mow the lawn?
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
This is a problem relating to harmonic average. Based on frequency (1/time): Tim: 1/1.5 = 2/3 lawn per hour Linda: 1/2 = 1/2 lawn per hour Tim + Linda: 1/2 + 2/3 = 7/6 lawn per hour Time (1/frequency): 6/7 hour per lawn, therefore working together they take 6/7 hour to mow the lawn
anonymous
  • anonymous
If you have seen the sum of parallel resistors, the formula works for the same reason. 1/Rt = 1/R1 + 1/R2
anonymous
  • anonymous
what is the final answer?

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anonymous
  • anonymous
6/7 hour
anonymous
  • anonymous
tell me in minutes if possible please
anonymous
  • anonymous
thank you adfriedm
radar
  • radar
Depends on how long John takes to mow the lawn. That information was not provided. Only provided what Tim could do the lawn. No solution, or problem is worded wrong.
radar
  • radar
Jovis209 did you copy this problem correctly?
anonymous
  • anonymous
yeap i did

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