Most average-sized cars are between 12 and 15 feet long. Mailboxes are usually around 1. 5 feet long. Mature tree trunks are typically between 1 and 2 feet wide. The standard length of a trailer pulled by a semi-truck is 50 to 65 feet long.
If your thumb jumped 3 times the length of a building that you believe is 100-feet-long, then it jumped 300 feet. If your thumb jumped half the length of a 14-foot-long car, then it jumped 7 feet.
If your thumb jumped 3 times the length of a 100-foot building, or about 300 feet (91 m), then you would multiply 300 by 10 to conclude that the building is about 3,000 feet (914 m) away from you. If your thumb moved half the length of a 14-foot-long car, or about 7 feet (2 m), then you would multiply 7 by 10 to conclude that the car is about 70 feet (21 m) away from you.
