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Leya [2.2K]
3 years ago
12

Working alone, Jamie can mow her lawn in 75 minutes. If Bob helps her, then the two

Mathematics
1 answer:
djyliett [7]3 years ago
8 0

Answer:

  • 50 minutes

Step-by-step explanation:

<u>Jamie's working speed is:</u>

  • 1/75 job/min

<u>And Bob's speed is</u>:

  • 1/x job/min

<u>Their working speed together is:</u>

  • 1/75 + 1/x = 1/30

<u>Solving for x:</u>

  • 1/x = 1/30 - 1/75
  • 1/x = 5/ 150 - 2/150
  • 1/x = 3/150
  • 1/x = 1/50
  • x = 50

Bob can do the job in 50 minutes

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