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Lily and her sister set out from the school1200m away from home at the same time. Sister walks every minute 100m, Lily walks 60m every minute, and Sister arrives at the school gate.
Fifteen minutes

Analysis: See you in X minutes.

You can tell from the title.

( 100 x- 1200)+60X = 1200

The solution is X= 15.

Analysis: 100X is the total distance traveled by my sister, (100X- 1200) is the total distance traveled by my sister, and 60X is the total distance traveled by Lili. Meeting refers to the distance traveled by the sister+Lili = the total distance, so the above formula is obtained.

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