Scratch

First you need the following sprites : One car and two wheels

I solved the problem by using the following code:

Stage:
<when green flag clicked>
<forever if><key[ right ]pressed?>
<broadcast[ goright
<end>

Code for:  Wheel 1 , Wheel 2 and car :

<when I receive[ goright
<point in direction( 90 )
<move( 3 )steps>
<end>

This will make the car and wheels move at exactly the same speed all in the same direction. Now drag and drop the wheels into the right position and run your program.

Now all you need to do is do the same for going left (but just change the broadcast to goleft and  <point in direction( 90 ) to <point in direction( -90 ).

I hope this helps.

OB6160

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That seems good but in the game im designing the wheels will probably have to calculate the angle for which the car should face (depending on hill).

Essentially from what I understand from your code is that you are telling all 3 pieces to go in the same direction and at the same speed. This sort of code could have unpredictable results perhaps??? I was looking for more of a way that the car would fix its position directly based on the position of the wheels.