[thehappypm]

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.

[sph]

You probably mean the pool quadruples in size, meaning it doubles in length.

[thehappypm]

No, I mean doubles across all axes. 1 unit cubed becomes 2 units cubed.