Casey types at a constant speed, as shown in the following table. words typed seconds 11 55 22 1010 77 3535 1212 6060 what does 55 mean in this situation?

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?