A bus and a truck leave from Party A and Party B at the same time. The speed of a truck is four-fifths that of a bus. After a quarter of the journey, the truck and the bus met for 28 kilometers. How many kilometers is it between A and B?

Solution: The speed ratio of passenger cars and trucks is 5: 4.

Then the distance ratio when meeting is 5: 4.

When they met, it was 4/9 of the whole truck journey.

At this time, the truck has traveled all the way 1/4.

4/9- 1/4=7/36 from the meeting point.

Then the whole journey = 28/(7/36) = 144km.

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