If Roshel and David work together on a project, they will complete it in 5 days. If David were to work with Jeremiah on the same project, they will take a day longer. If Jeremiah and Rachel work together, they will take 60% more time than Roshel and David. If Roshel and Rachel were to work together, how many more days will they take to complete the project compared to David and Jeremiah working together?
Time taken by Roshel and David in percent = 100%
Time taken by Jeremiah and Rachel = 100% + 60% = 160%

Time taken by Roshel and David = 5 days ---- (1)
Time taken by David and Jeremiah = 6 days ---- (2)
Time taken by Jeremiah and Rachel = 160% x 5 = 8 days ---- (3)

(1) + (2) + (3)
Roshel + David + David + Jeremiah + Jeremiah + Rachel → 5 + 6 + 8 = 19 days
Roshel + 2 (David + Jeremiah) + Rachel → 19 days
Roshel + Rachel + 2 x 6 → 19 days
Roshel + Rachel → 19 - 12 = 7 days

More days to complete the project for Roshel and Rachel compared to David and Jeremiah
= 7 - 6
= 1

Answer(s): 1