Concept:Divide the remaining time equally among the remaining questions.Explanation:Total time used is 2 hours = 120 minutes.He spent 20 minutes on the first question.Remaining time for the other questions:120−20=100 minutesHe answered 9 questions in total, so the remaining questions are 9−1=8.Time spent on each remaining question:8100=12.5 minutesAnswer:12.5 minutes, which is option D.