Bob can paint a fence in 5 hours and working with jen, the two of them can paint the same fence in 2 hours. how long would it take for jen to paint the fence alone?

Bob ;

5 hours = 1 fence
1 hour = 1/5 fence

Together:
2 hours = 1 fence
1 hour = 1/2 fence

Jen:
1 hour = 1/2 - 1/5= 5/10 - 2/10 = 3/10

Find the amount of time Jen will need:
3/10 fence = 1 hour
1/10 fence = 1/3 hour
10/10 fence = 10/3 hour = 3 1/3 hours 

Jen will take 3 1/3 hours to paint the fence alone.

7days is 168 hours in decimal form it is just 168 there is no decimal form for this because it is like 168.0 and there is no number you are dividing it by for it to be a decimal.hope this