It takes sam 3 hours to do all of the yard work, but it takes his brother carl only 2 hours. how long, in hours, would take them to do the yard work if they work together?

a.

5/6

b.

2/3

c.

6/5

d.

3/2

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm