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In a mirror image, the Left side becomes Right and the Right side becomes Left. The top and bottom remain unchanged. This is called Lateral Inversion.
In a water image, the Top becomes Bottom and the Bottom becomes Top. The left and right sides remain unchanged. It is like a reflection in water.
Symmetrical Letters (Mirror): A, H, I, M, O, T, U, V, W, X, Y (These look the same in a mirror).
Symmetrical Letters (Water): C, D, E, H, I, K, O, X (These look the same in water).
Mirror Image Time: Subtract the given time from 11:60 (or 23:60 for 24hr format).
Water Image Time: Subtract the given time from 18:30. If minutes are > 30, subtract from 17:90.