题目

Check out our tsunami (海啸) facts and lean some interesting information related to these great walls of water that can cause so much destruction. Find out what causes tsunamis and read about some notable recent examples of tsunamis that have occurred around the globe.Tsunamis are huge waves of water that are usually caused by earthquakes or volcanic eruptions.As a tsunami approaches the shore, water may move back from the coast. If it is shallow enough, the water may be pulled back hundreds of meters. If you are in the area, observing this is a good indication that a tsunami is on the way.R如图，点 A、B 在数轴上表示的数分别为﹣12 和 8，两只蚂蚁 M、N 分别 从 A、B 两点同时出发，相向而行．M 的速度为 2 个单位长度/秒，N 的速度为 3 个单位长度/秒．（1）运动 秒钟时，两只蚂蚁相遇在点 P；点 P 在数轴上表示的数 是 ；（2）若运动 t 秒钟时，两只蚂蚁的距离为 10，求出 t 的值（写出解题过程）．