Difficulty: Easy
Correct Answer: 13 h 48 min
Explanation:
Introduction / Context:Time-elapsed questions require careful handling across a.m./p.m. boundaries. We break the interval into two parts: morning to noon, then noon to evening, and add the results.
Given Data / Assumptions:
Concept / Approach:Compute the difference piecewise: from 6:14 to 12:00 (noon), then from 12:00 to 20:02. Sum hours and minutes at the end, regrouping minutes if needed.
Step-by-Step Solution:
6:14 → 12:00 = 5 hours 46 minutes.12:00 → 20:02 = 8 hours 2 minutes.Total = (5 h + 8 h) and (46 min + 2 min) = 13 h 48 min.Verification / Alternative check:
Convert to minutes: 6:14 = 374 min after midnight; 20:02 = 1202 min. Difference = 828 min = 13 × 60 + 48.Why Other Options Are Wrong:
12 h 16 min / 14 h 16 min result from miscounting noon boundary; 2 h 12 min is clearly too small.Common Pitfalls:
Forgetting that p.m. adds 12 hours to the 12-hour clock value (except for 12 p.m.).Arithmetic mistakes when adding minutes around the noon split.Final Answer:13 h 48 min
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