Answer: Option 'A' is correct.
Step-by-step explanation:
Since we have given that
Number of hours Wade take to paint a certain room = 7 hours
Number of hours Rhondda take to paint a certain room = 5 hours
Work done by Wade is given by [tex]\dfrac{1}{7}[/tex]
Work done by Rhondda take to paint a certain room = [tex]\dfrac{1}{5}[/tex]
Work done if they working together is given by
[tex]\dfrac{1}{7}+\dfrac{1}{5}\\\\=\dfrac{7+5}{35}\\\\=\dfrac{12}{35}[/tex]
Number of hours if they working  together to paint the room is given by
[tex]\dfrac{35}{12}=2.916\approx 2.92\ hours[/tex]
Hence, option 'A' is correct.
