Powergirl cousin of Superman?

Did you know that Powergirl real name Kara Zor-l, is a cousin of Superman? Yes they were cousins. During the destruction of Planet Kyrpton, she and Superman left at the same time but her spaceship took to Earth after Superman. Hmmm? I wonder why she took longer in her travel than her cousin? Maybe I can answer that case in the near future.

Source: wikipedia.com