Originally Posted by

**shepherdm1270** So I solved for x, but I'm still confused where to take it from there. I know that x = 2.6666 or 2 2/3...

i figured out that the distance between A and B when taking a direct route diagonially ( the C^2 in the pythagorean theorum) is 10.81

Thus:

Using endpoint 0 ( 9 on land, 6 underwater ) you get 3600 + 3000 = $6600

Using endpoint 9 ( all underwater) or 10.81 under ($500) you get $5408.33

Therefore I know it is cheaper to go completely underwater than from A to C then from C to B...

however I'm not sure about the middle ones... :-\