Are we to assume that the line ABisthe "wall" you mention?

Given points and , the equation of the line through them is or .

Find the equations of the two lines in that form and set the "y"s equal:

The line through A and B is and the line through C and D is . Setting those two "y"s equal gives the linear equation which you can solve for x.

Now, go back and write line CD in terms of t. Since the line passes through C at t= 0 and D at t= 1, it can be written as , .

Put the value you got for x or y into one of those equations and solve for t.

I started this problem by taking an infinite length line AB and from the given data , the distance of CD is V(v=velocity from C to D). But I am unable to understand about how to find the intersection of the two lines. I started by trying to find if C and lie on either side of AB or on AB but could not proceed much with this. Can someone plz help me out with problem.

Thanx a lot ,

Aarav