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Jeff can put shingles on a house in 9 hours while David can shingle the same house in 6 hours. If the two work together, how long would it take them to shingle the house?

about 4 hours and 30 minutes
about 4 hours
about 3 hours and 30 minutes
about 3 hours

Respuesta :

Answer:

3 hours and 30 minutes

Explanation:

Answer:

3 hours and 30 minutes

Explanation:

W = [tex]\frac{1}{9}t + \frac{1}{6}t\\\\[/tex]

1 = [tex]\frac{2}{18}t + \frac{3}{18}t[/tex]

1 = [tex]\frac{5}{18}t[/tex]

[tex]\frac{18}{5} = t[/tex]

3.6 → 60 decimal hours equals 36 minutes so the answer would be 3 hours and 30 minutes.

The chart I have attached shows decimal hours converted to hours. It helped me with this question.

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