Puzzle 1:
Answer: 6:06
Explanation: From Left to Right, The time on the watches increases by 2 hours 3 minutes, then decreases by 1 hour 16 minutes, alternately.
Puzzle 2:
Answer: 3:36
Explanation: On each watch, the time shown contains two digits that are the same.
Puzzle 3:
Answer: 6:45
Explanation: From left to right, add 1 to the value of each digit on the watch, and rotate the digits one place to the left.
Puzzle 4: Calculate the angle between the two hands of clock when the clock shows 4 : 20 p.m. ?
A) 5 degrees B) 10 degrees
C) 15 degrees D) 25 degrees
Answer: B) 10 degrees
Explanation: Since at 4 : 20 the minute hand will be at 4 and the angle between them will be same as the distance covered in degree by the hour hand in 20 minutes.
Required angle = distance of hour hand = speed × time = ½ × 20 =10 degrees.
Puzzle 5: If a Siren sounds for every 5 seconds, how many times will it sound in ¾ of an hour?
A) 541 times B) 540 times
C) 450 times D) 275 times
Answer: A) 541 times
Explanation: There are 60 minutes in an hour.
In ¾ of an hour there are (60 × ¾) minutes = 45 minutes.
In ¾ of an hour there are (60 × 45) seconds = 2700 seconds.
Siren sounds for every 5 seconds.
In 2700 seconds 2700/5 = 540 times.
The count start after the first sound, the Siren will sound 541 times in ¾ of an hour.