Arrange the following times in ascending chronological order (24-hour format). (a) 0640 hrs (b) 1930 hrs (c) 1335 hrs (d) 2000 hrs
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Ad, b, c, a
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Ba, d, c, b
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Ca, b, c, d
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Da, c, b, d
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Eb, a, c, d
Answer
Correct Answer: a, c, b, d
Explanation
Introduction / Context:Chronological ordering in 24-hour time requires comparing hours first and then minutes within equal hours. The goal is earliest to latest.
Given Data / Assumptions:
- Times: 0640, 1335, 1930, 2000.
- Format is HHMM in 24-hour time.
Concept / Approach:Order by hour; within same hour, order by minutes. Morning hours (00–11) come before afternoon (12–17), which come before evening/night (18–23).
Step-by-Step Solution:0640 is the smallest hour (06).Next is 1335 (13:35).Then 1930 (19:30).Finally 2000 (20:00).
Verification / Alternative check:Convert to minutes since midnight: 400, 815, 1170, 1200. Sorted list matches a → c → b → d.
Why Other Options Are Wrong:Any order placing 2000 before 1930 or 1335 before 0640 violates ascending order.
Common Pitfalls:Confusing 24-hour with 12-hour format, or misreading 1930 as 7:30 AM.
Final Answer:a, c, b, d