posted by Thad on .
Wong's left at 7:00. It took him one and a half hours to check in at the airport. His house is an hour drive from the airport. At what time did Wong leave his house to get to the airport?
I am assuming it is a plane that left at 7:00.
(7:00)-(1.5 hrs check-in)-(1hr drive from house)=4:30