Respuesta :

1. Needed information : working efficiency of Flo and Bryan

Step-by-step explanation:

2. total number of hours needed by Flow and Bryan to mow the lawn if they are working together

Working efficiency of both Flo and Bryan is given by the equation:

[tex]h/3 +h/6=1[/tex]

  • [tex]h/3[/tex] is the working efficiency of one person
  • [tex]h/6[/tex] is the working efficiency of second person
  • since they are working together the order does not matter

[tex](3h+6h)/18 =1\\9h=18\\h=18/9=2[/tex]

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