Answer: Option 'A' is correct.
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
![(1)/(7)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/qt1x0q5fvos8dptyfq89f5se4sz2wfi2l2.png)
Work done by Rhondda take to paint a certain room =
![(1)/(5)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/j3n2hs8odtbh89cmpni7cxa60rqb3f8kxs.png)
Work done if they working together is given by
![(1)/(7)+(1)/(5)\\\\=(7+5)/(35)\\\\=(12)/(35)](https://img.qammunity.org/2020/formulas/mathematics/high-school/q6o1i5tgrrg77jkqnyionegx2ckkilqp3v.png)
Number of hours if they working together to paint the room is given by
![(35)/(12)=2.916\approx 2.92\ hours](https://img.qammunity.org/2020/formulas/mathematics/high-school/f3utl5wvwtv71ue84g2n75vx0az9gds8fr.png)
Hence, option 'A' is correct.