I am very very sorry about this I spoke with him after coming back. He agreed with everything . but not have reason from him that why drive very fast!
I've already warned him about it and tell him to use the speed does not exceed 120km/hr. I don't know what happened to him. But for me, suspect and he is under observation and keep an eye on him This is why I recruit new driver right now. Don't think that bother but safety first for you and everybody included him.
I'm sorry you and everyone again for what happened