The distance between A and B is 360 kilometers, and the bus and truck leave from A to B at the same time. The speed of the truck is 60 kilometers per hour and the speed of the bus is 40 kilometers per hour. After the truck arrives at point B, stop for half an hour and return to point A at the original speed. () hours later, two cars meet from a? [360-40X(360÷60+ 1/2)]÷(60+40)

= 100÷ 100

= 1

1+6+ 1/2

=7.5 hours