Joke Collection Website - Bulletin headlines - Xiao Min and his mother run and exercise on the lake every day. The road around the lake is 840 meters long, Xiao Min runs 108 meters per minute, and her mother runs 92 meters per minute.

Xiao Min and his mother run and exercise on the lake every day. The road around the lake is 840 meters long, Xiao Min runs 108 meters per minute, and her mother runs 92 meters per minute.

Let Xiao Min's n circle exceed his mother's whole circle, then 840 (n+1)108 = 840n/92,92 (n+1) =108n, (108-.