Math problem: A needs 10 hour to complete AB, and B needs 15 hour. If two people leave from two places at the same time, how many hours will it take to meet?

This is a problem of mathematical distance, and the solution is as follows:

Solution: Let Party A and Party B meet for x hours, and the total distance is 1.

x/ 10+x/ 15= 1

x=6

So, Party A and Party B met six hours later.

I don't know if this is what you want to ask.