If Nora and Harper work together on a project, they will complete it in 10 days. If Harper were to work with Sebastian on the same project, they will take a day longer. If Sebastian and Jack work together, they will take 130% more time than Nora and Harper. If Nora and Jack were to work together, how many more days will they take to complete the project compared to Harper and Sebastian working together?
Time taken by Nora and Harper in percent = 100%
Time taken by Sebastian and Jack = 100% + 130% = 230%

Time taken by Nora and Harper = 10 days ---- (1)
Time taken by Harper and Sebastian = 11 days ---- (2)
Time taken by Sebastian and Jack = 230% x 10 = 23 days ---- (3)

(1) + (2) + (3)
Nora + Harper + Harper + Sebastian + Sebastian + Jack → 10 + 11 + 23 = 44 days
Nora + 2 (Harper + Sebastian) + Jack → 44 days
Nora + Jack + 2 x 11 → 44 days
Nora + Jack → 44 - 22 = 22 days

More days to complete the project for Nora and Jack compared to Harper and Sebastian
= 22 - 11
= 11

Answer(s): 11