Multiple choice general knowledge science & technology The Speed of light is 186,00 miles per minute 186,000 miles per hour 186,000 miles per minute 186,000 miles per second Reveal answer Fill a bubble to check yourself D Correct answer Explanation The speed of light is 186,000 miles per second (option D). This is the correct value in imperial units. Options A, B, and C have wrong units (per minute, per hour) or wrong values. Light speed is a fundamental constant.