Difficulty: Medium
Correct Answer: 8 h 15 min
Explanation:
Introduction / Context:For a standard mirror image of an analog clock, the rule to find the actual time is to subtract the mirror reading from 11:60 (or 12:00 with careful minute borrowing). This flips the positions appropriately.
Given Data / Assumptions:
Concept / Approach:Use the conversion: Actual time = 11:60 − Mirror time (hh:mm). Handle the minute borrowing when necessary.
Step-by-Step Solution:
11:60 − 3:45 = (11 − 3) : (60 − 45) = 8 : 15 ⇒ 8:15Verification / Alternative check:Check with symmetry: 8:15’s mirror indeed looks like 3:45 because 8:15 and 3:45 are complementary to 12:00 in mirror logic.
Why Other Options Are Wrong:9:30, 9:15, 8:45 are not complements of 3:45 to 11:60; drawing the hands quickly shows mismatched positions.
Common Pitfalls:Subtracting from 12:00 directly without converting to 11:60 first, which can cause minute-borrowing mistakes.
Final Answer:8 h 15 min.
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