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

Step-by-step explanation:

Given

Bob can Paint a fence in 5 hr

so full job can be done in 5 hr

in 1 hr job is done

suppose Jen done the work in x hr

so in 1 hr part of job is done

Also if they combine they can do the job in 2 hr

so in 1 hr

so

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2

i dony know

step-by-step explanation: