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How did Superman and Supergirl both escape from Krypton?

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Christopher Reeve as Superman in a blue suit with red cape and yellow belt, flying with one arm forward against a dark background in a publicity still from Superman: The Movie. — Superman Christopher Reeve in *Superman* (1978), directed by Richard Donner.

Superman and Supergirl escaped the destruction of their home planet, Krypton, through different circumstances:

Superman: He was sent to Earth as an infant by his biological father, Jor-El, in a rocket to escape the planet's impending destruction.1
Supergirl: Following the explosion of Krypton, her hometown of Argo City survived by being hurled into space on a chunk of planetary debris. When the city's population began suffering from exposure to Kryptonite, her father, Zor-El, rocketed her to Earth to join her cousin.12

While early depictions often showed Supergirl arriving on Earth as a teenager, modern comic book iterations have frequently adjusted her origin to explain why she is younger than Superman upon arrival. These versions often state that she was sent to Earth to protect her cousin and remained in a state of suspended animation during her journey, or that her trip was delayed by hurdles in space.1