Discussion
What will be the time shown by the water image of clock showing time 4 Hours 45 Minutes?
Answer: A
The water image of 4:45 reads 1 Hour 45 minutes.
A water image is the reflection in a mirror lying flat below the clock, which turns the dial upside down. The standard rule is: if the minutes are 30 or more, subtract the time from 17:90; if they are under 30, subtract from 18:30.
\[ 17{:}90 - 4{:}45 = 13{:}45 \]
13:45 on a 12-hour dial is 1:45. A direct check agrees: the minute hand at 9 lies on the line of reflection and stays at 9, so the minutes are 45, and the hour hand moves from just before 5 to just past 1.
Options (b), (c) and (d) have minute hands at 3, 7 and 5 respectively, but a minute hand pointing at 9 cannot move, so none of them can be the reflection.
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