Can Two Streamlines Cross Each Other?

Two streamlines cannot cross each other, because there will be two velocities at the point of intersection, which is not possible.

Can 2 streamlines cross each other why?

Two streamlines cannot cross each other. Why? Streamline is a line, straight or curved tangent to which at any point gives the direction of flow of liquid at that point. If two streamlines cross each other, then at that point there will be two tangents and hence two directions of flow of liquid, which is impossible.

What would happen if 2 streamlines intersect?

Now, if two streamlines intersect each other, then there will be two different velocity vectors at a point at the same time in a flow field which is impossible.