James knows that when he walks, he takes about 120 steps per minute and that each step is 2.75 feet long. which calculation is most reasonable for james to use to find out his walking speed in miles per hour?

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?