Determining exact clock overlap times using relative angular speed
Question
Consider the following statements:
Which of the above statements is/are correct?
Options
1 only
2 only
Both 1 and 2
Neither 1 nor 2
Explanation
Statement 1: The hour and minute hands coincide when the angle between them is 0^\circ. Using the formula θ = 30H - 5.5M = 0: 30(3) = 5.5M \implies 90 = 5.5M \implies M = 90/5.5 = 180/11 = 16.36 minutes. Since 16.36 minutes falls exactly between the 16th and 17th minute marks, Statement 1 is correct.
Statement 2: The minute hand and the second hand. The second hand completes a full 360^\circ sweep of the entire clock face during every single 1-minute interval. Consequently, it is physically guaranteed to pass over the slow-moving minute hand exactly once during any given minute (excluding perfect overlaps at the exact 60s boundary). Between 4:58 and 4:59, the minute hand sits near the 58-minute mark. As the second hand sweeps through its 60-second cycle, it will inevitably overtake the minute hand around the 58th second. Statement 2 is geometrically irrefutable.
Answer: (c).
Question details
Year
2022
Paper
CSAT
Question
Q68
Section
Logical & Analytical Reasoning
Sub-topic
Clocks
Type
Statement-based
Difficulty
Hard
Source hint
Hands coincide between 3:16 and 3:17
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