If Luke and Owen work together on a project, they will complete it in 5 days. If Owen were to work with Nora on the same project, they will take a day longer. If Nora and Riordan work together, they will take 120% more time than Luke and Owen. If Luke and Riordan were to work together, how many more days will they take to complete the project compared to Owen and Nora working together?
Time taken by Luke and Owen in percent = 100%
Time taken by Nora and Riordan = 100% + 120% = 220%

Time taken by Luke and Owen = 5 days ---- (1)
Time taken by Owen and Nora = 6 days ---- (2)
Time taken by Nora and Riordan = 220% x 5 = 11 days ---- (3)

(1) + (2) + (3)
Luke + Owen + Owen + Nora + Nora + Riordan → 5 + 6 + 11 = 22 days
Luke + 2 (Owen + Nora) + Riordan → 22 days
Luke + Riordan + 2 x 6 → 22 days
Luke + Riordan → 22 - 12 = 10 days

More days to complete the project for Luke and Riordan compared to Owen and Nora
= 10 - 6
= 4

Answer(s): 4