Question Unless otherwise posted, the speed limit in a residential area is: Answers 15 mph. 20 mph. 25 mph. 30 mph. Explanation Unless posted otherwise, the speed limit in a business or residential area is 25 miles per hour. If another speed is posted, follow that speed limit. Pass your DMV Written Test with flying colors Take me to the cheat sheet Utah This questions appears in the following tests: Utah Practice Test 23 Utah Practice Test 15