I remember I had this model when I was studying mathematical modeling. It was called walking in the rain. One of the conclusions is that the faster Blabla walks, the better. The following is the answer from this model: (1) If the rain comes from the front or the side, run as fast as possible. (2) If the rain comes from the rear or side, and the speed is so low that when people stand in the rain, their backs are not as wet as other parts, then run as fast as possible. (3) If it rains heavily and people get more rain on their backs than other parts of their bodies when standing in the rain, it is best not to let their chest and back get wet when running. The model is made of a cuboid, which is said to be simpler if people are regarded as cylinders.

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