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Working alone, Jamie can mow her lawn in 75 minutes. If Bob helps her, then the two
can mow the lawn in 30 minutes. How long does it take Bob to mow the lawn alone?​

Respuesta :

mhanifa

Answer:

  • 50 minutes

Step-by-step explanation:

Jamie's working speed is:

  • 1/75 job/min

And Bob's speed is:

  • 1/x job/min

Their working speed together is:

  • 1/75 + 1/x = 1/30

Solving for x:

  • 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