Mathmatic genies click here --> a Puzzle needs to be solved!

[mdwh2]

@Wain

Isn't it dragonwidth + screenwidth, and not dragonwidth*2 + screenwidth?

The dragon has to move a distance equal to its width so that the left end of the dragon reaches the left side of the screen (assuming we're going left to right). Then it has to move a distance equal to the screen width so that the left end of the dragon reaches the right side of the screen - and then we're done.

[mdwh2]

I'm rather tired so I may certainly be missing something here.. but:

I realise that the total distance we are dealing with is 2*dragonwidth + screenwidth. But I presume that the dragon is already starting with its nose up against the left edge of the screen; it's not like the dragon starts off *before* this region of width 2*dragonwidth + screenwidth. Any given point on the dragon only moves the distance of the dragonwidth, plus the screenwidth