How to move an object into a specific direction with a constant speed?

Question

I want to move an object into a specific direction. Here is the method I'm using:

    private void calculateDirection(float aimX, float aimY) {
       // calculating distance to target
       float xDistance = aimX - x;
       float yDistance = aimY - y;
       x += xDistance / 10 * speed * delta();
       y += yDistance / 10 * speed * delta();
    }

It works good so far, but as you can see the x and y variables are divided by 10 which leads to the object moving fast firstly and then, when xDistance and yDistance getting smaller the object gets slower and slower. How do I make a calculation that moves the object in the exact same speed all the time?

I already tried something like this:

x += xDistance / +xDistance;

but it won't work somehow.