Puzzle 1: How many times in a day, the hands of a clock are straight?
A. 22 B. 44 C. 24 D. 48
Answer: 44
Explanation: In 12 hours, the hands coincide or are in opposite direction 22 times.
In 24 hours, the hands coincide or are in opposite direction 44 times a day.
Puzzle 2: At 3.40, the hour hand and the minute hand of a clock form an angle of?
A. 120° B. 130° C. 125° D. 135°
Answer: 130°
Explanation: Angle traced by hour hand in 12 hrs = 360°
Angle traced by it in 11/3 hrs = (360/12) * (11/3) = 100°.
Angle traced by minute hand in 60 mm = 360°.
Angle traced by it in 40 mm = (360/60) * 40 = 240°.
Required angle = (240 – 110)° = 130°.
Puzzle 3: How many times do the hands of a clock coincide in a day?
A. 24 B. 21 C. 20 D. 22
Answer: 22
Explanation: The hands of a clock coincide 11 times in every 12 hours (Since between
11 and 1, they coincide only once, i.e. at 12 o’clock.
The hands coincide 22 times in a day.
Puzzle 4: What time does the last watch indicate?Answer: 11:01
Explanation: Taking the hour and minute values on each watch separately, as you move to the right the hour value increases by 1, 2, 3 and 4, and the minute value decreases by 11, 22, 33 and 44.
Puzzle 5: What time does the last watch indicate?Answer: 8:00
Explanation: On each watch, the sum of the digits shown equals 8.