12:00 will have both hands pointing up 12:30 will have the straight line at the half past part but it will not be exactly on the 12 3:45 it will be past the 3 and exactly on 45 so it will not work And 6:00 will be a straight line as one hand will be at the 12 and and it will be straight on the 6 as it is on the hour so the answer is d
If you divide the 10 pages she has read by the total 15 pages, you get 0.66. Another way to get this is to put 10 over 15. Divide both the numerator and denominator by 5 to get 2/3.