If Rebecca and Ethan work together on a project, they will complete it in 4 days. If Ethan were to work with Hannah on the same project, they will take a day longer. If Hannah and Caleb work together, they will take 200% more time than Rebecca and Ethan. If Rebecca and Caleb were to work together, how many more days will they take to complete the project compared to Ethan and Hannah working together?
Time taken by Rebecca and Ethan in percent = 100%
Time taken by Hannah and Caleb = 100% + 200% = 300%

Time taken by Rebecca and Ethan = 4 days ---- (1)
Time taken by Ethan and Hannah = 5 days ---- (2)
Time taken by Hannah and Caleb = 300% x 4 = 12 days ---- (3)

(1) + (2) + (3)
Rebecca + Ethan + Ethan + Hannah + Hannah + Caleb → 4 + 5 + 12 = 21 days
Rebecca + 2 (Ethan + Hannah) + Caleb → 21 days
Rebecca + Caleb + 2 x 5 → 21 days
Rebecca + Caleb → 21 - 10 = 11 days

More days to complete the project for Rebecca and Caleb compared to Ethan and Hannah
= 11 - 5
= 6

Answer(s): 6