Here's how inheritance is typically drawn in UML.
When the top two classes are in one package and the bottom class is in another package the effect is to create a package dependency pointing upwards (think of the inheritance triangle as a fat arrowhead). It's odd that this style for drawing inheritance is so dominant as it is in stark contrast to how package/layer dependencies are typically drawn - pointing downwards. The solution is simple - rotate the diagram!
However, associations are conventionally drawn left to right.
Again the solution is simple - this time the diagram needs a reflection!