Help: Old Ruins #13 and Murky Depths #3 (Alternative)

So, basically, I'm stuck in these two levels.
The Murky Depths one is mildly easy, it's the one you must ramp off a car into an inverted U thingy to open a door and exit the level. I guess I just need to try it over and over, but it anyone could give a hint I'd be glad.

As for Old Ruins, this is that level where you need to make a few blocks (that have wheels over them) disappear so that a plank falls bridging a gap. I've got the plank in place twice after hours of trying, but couldn't find a way that would consistently drop it correctly. Without help, I'm pretty much giving up on this level and finding a way to hack the savegame or something like that.

Thanks in advance!

I assume you mean Murky Depths 4 and not 3.  Hint: You need to make the car fall.

Old Ruins: http://www.youtube.com/watch?v=hpMRHctTFK8

There's a much easier and more consistent way of completing Old Ruins #13, which needs no timing whatsoever.

And as said for Murky Depths #4, you'll need to tip the car over and LOTS of speed.

I had tipped the car over a few times, but it never occured to me that it would be the solution.

As for Old Ruins, I managed it in a stroke of luck, but I'll surely remember to do it the right way the next time.

Thanks again, guys!