A clock shows 3:15. What time will its mirror image show?

Explanation

In this 12-hour clock problem, subtract 3:15 from 11:60 to find the time shown in the mirror. The calculation is 11:60 - 3:15 = 8:45: 60 - 15 = 45 minutes and 11 - 3 = 8 hours. Therefore, the mirror reads 8:45, not 9:45 or 9:15.

Why the other options are wrong

• (B) 9:45 has the correct reflected minutes, 45, but the hour is wrong: 11 - 3 = 8, not 9.
• (C) 9:15 leaves 15 minutes unchanged and also uses the wrong hour. Under the rule, the minutes should be 60 - 15 = 45 and the hour should be 11 - 3 = 8.
• (D) 8:15 has the correct reflected hour, 8, but leaves the minutes unchanged at 15. The mirror calculation changes 15 minutes to 45 minutes.

Concept

This mirror-image shortcut is part of Reasoning and Mental Ability. In RAS-style practice, it checks whether candidates can apply a fixed rule quickly and avoid visually similar options.

Source

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