If Hannah and Salik work together on a project, they will complete it in 5 days. If Salik were to work with Andrew on the same project, they will take a day longer. If Andrew and Harris work together, they will take 140% more time than Hannah and Salik. If Hannah and Harris were to work together, how many more days will they take to complete the project compared to Salik and Andrew working together?
Time taken by Hannah and Salik in percent = 100%
Time taken by Andrew and Harris = 100% + 140% = 240%

Time taken by Hannah and Salik = 5 days ---- (1)
Time taken by Salik and Andrew = 6 days ---- (2)
Time taken by Andrew and Harris = 240% x 5 = 12 days ---- (3)

(1) + (2) + (3)
Hannah + Salik + Salik + Andrew + Andrew + Harris → 5 + 6 + 12 = 23 days
Hannah + 2 (Salik + Andrew) + Harris → 23 days
Hannah + Harris + 2 x 6 → 23 days
Hannah + Harris → 23 - 12 = 11 days

More days to complete the project for Hannah and Harris compared to Salik and Andrew
= 11 - 6
= 5

Answer(s): 5