Logical Reasoning
hardQ. No. 19702
At 47 minutes past 1, how many degrees separate the two clock hands along the shorter arc?
Last Updated:
A136.5°
B131.5°
C126.5°
D141.5°
Correct Answer: 131.5°Your Answer: B
Explanation
Correct answer: Option B — 131.5°. Their absolute difference is 228.5°; the smaller angle is 131.5°. Option A (136.5°) is rejected because it does not equal the computed result; it represents a counting, direction, leap-year, interval, or hand-motion error. Option C (126.5°) is rejected because it does not equal the computed result; it represents a counting, direction, leap-year, interval, or hand-motion error. Option D (141.5°) is rejected because it does not equal the computed result; it represents a counting, direction, leap-year, interval, or hand-motion error.
Important Notes
- Read the complete condition before calculating and write the required reference point, date, or clock time separately. This prevents a correct calculation from answering the reverse question.
- Keep units consistent. Reduce day differences modulo 7; treat 12 on a clock as zero for angle work; and convert gained or lost minutes into the same time unit as the stated interval.
- Check boundary cases explicitly: February, century years, noon, midnight, and an angle greater than 180 degrees often change the apparent answer. A century is a leap year only when divisible by 400.