Ok, here is some more info for you to ponder over.
There was a 5th passenger, young girl who got out before this happened. It’s lead to believe the speed was around 160kph.
The reason being they were chasing a black WRX. The owner of the WRX apparently hit/abused/assaulted one of the girls in the car.
I guess more will be known when the Police finish with the 5th girl, and get a chance to talk to the girl in hospital (if she pulls through).