Shawna can pour a large concrete driveway in six hours . dan can pour the same driveway in seven hours. find how long it would take them if they worked together?

work in  rates per hour :-

1/6 + 1/7 = 1/x

 Multiply through by the LCD,  42x:-

7x +  6x =  42

x = 42 / 13 = 3.23 hours answer

or about 3 hours 14 minutes

dont think so

step-by-step explanation:

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.