Imagine you’re swimming in a magical pool with some friends and the entire pool doubles in size over the course of a second. Your friend right next to you who

Imagine you’re swimming in a magical pool with some friends and the entire pool doubles in size over the course of a second. Your friend right next to you who was one foot away is now two feet. The absolute distance just grew by 1 foot, a rate of 1 foot/second. Your friend across the pool who was 10 feet is now 20 feet away. Absolute distance just grew by 10 feet, or a rate of 10 ft/sec.