3X+ 10=5X

X=5

So, A and B are 25 meters apart.

What matters is not the process, but the way to solve the problem. When you get a problem, you should look for the angle to solve it. Once the breakthrough point is found, the following problems will be solved. You can ask me questions about mathematics in the future. Although I studied law, I liked math, English, history and geography in high school. I hope I can help you, hehe.