Party A and Party B are several meters apart. If you face each other at the same time, 1 minute can meet. If two people go in the same direction, A is behind, and they can catch up in 4 minutes.

B is 60 meters per minute, and A is walking (100) meters per minute.

(x-60)×4 =(x+60)× 1；

3x = 300

x= 100

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