Quizz time XI Back to the future.
in the future, a mad engineer accidently found time machine. he use the machine to go back in the past and change history (by stealing idea from Bill Gates, Steve Job, and Larry Page). he go at 20.30 , November 2 2040. he turn the machine to back 1899999000 second in the past. he arrived at somewhere in the past. after a while future police arrest him and transport back to the future exactly at 2 am in August 20 1980. Question how many time the mad engineer spent his time in the past?