Question During school hours, the speed limit in a school zone is: Answers 15 mph. 20 mph. 25 mph. 30 mph. Explanation Unless otherwise posted, the speed limit is 20 miles per hour in a school zone during school hours, while children are present, and/or while flashing lights are activated. 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 6 Utah Practice Test 23