Question 13. When I look in a mirror, I can see the image of my digital clock standing on the table behind me, as shown. What image will I see when I look in the mirror 30 minutes later? First, it is important to recognize that the time shown, 12.15, is not the current time, but the time that is reflected in the mirror. The other thing to recognize is the mirror will reflect things backwards, so the actual time is 21.51. 30 minutes after 21.51 will be 22.21, and when we flip that in the mirror, we will get 15.55, so the answer will be D.

mirror reflection

digital clock

time calculation

backwards reflection

question 13