A person on a moving sidewalk travels 20 feet in 5 seconds. the moving sidewalk has a length of 80 feet. how long will it take to move from one end to the other?
It will take 20 seconds to move from one end to another because if 20 feet is moved within 5 seconds, do that 4 more times to get to 80. Finally, multiply 5 by 4 to get 20 seconds.
