#9 . . . #12, and #14: Excellent. All correct, and good estimates.
#13: A very picky comment:
Your math is correct, but the camera can't take 2/3 of an image.
That's why the question asked "How many complete images ...".
After 66 images, there is still some time remaining, but not enough
for another image. So it captures 66 complete images in 3 seconds.
If you are really in elementary school, then I think you're doing
the work of a prodigy. Keep it up ! And best of luck to you.