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Wang Chao, a math teacher.
According to the tension speed and time

The distance between Party A and Party B is 5x 12 = 60km.

It is also known that the speed of the king is 60/10 = 6 km/h.

When catching up with Li Lin, that is, when the distance between two people is equal, there are:

4X=6(X-2)

There is X=6

6+6= 12

That is, twelve noon.

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