Explanation:

The whole journey takes 10 hour for trucks and 8 hours for buses, and the travel time ratio between trucks and buses is 10: 8.

Therefore, the speed ratio of passenger cars and trucks is 10: 8.

When two cars meet, the ratio of the distance traveled by the truck and the bus is equal to the ratio of the speed.

Distance sum: distance difference = speed sum: speed difference

Or: Time = (distance sum): (speed sum) = (distance difference): (speed difference)

The sum of distances is the total distance.