19
Q:

A clock is started at noon. By 10 minutes past 5, the hour hand has turned through:

A) 145 B) 150
C) 155 D) 160

Answer:   C) 155

Explanation:

Angle traced by hour hand in 12 hrs = 360º.

Angle traced by hour hand in 5 hrs 10 min.  i.e.,{\color{Black} \frac{31}{6}} hrs {\color{Black} \left ( \frac{360}{12} \times \frac{31}{6}\right )^o}= 155º

Subject: Clock puzzles
Q:

Answer the following puzzle

Answer

7:05


Explanation: As you move from left to right, the time shown on each watch decreases by 12 minutes, then 24, 36 and 48.

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Subject: Clock puzzles

5 621
Q:

Answer the following puzzle

Answer

6:45


Explanation: As you move from left to right, add 1 to the value of each digit on the watch, and rotate the digits one place to the left.

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Subject: Clock puzzles

9 779
Q:

Answer the following puzzle

Answer

To the 6


Explanation:


Starting with the top left clockface and working clockwise around the others, the sum of the numbers pointed to by the 2 hands starts at 3 and increases by 2 each time.

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Subject: Clock puzzles

4 588
Q:

Answer the following puzzle

Answer

Hour hand points to 8


Explanation:


Starting with the top clockface, and moving clockwise around the others, the minute hand moves forward 15 minutes, while the hour hand moves back 2 hours each time.

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Subject: Clock puzzles

1 552
Q:

At 3.40, the hour hand and the minute hand of a clock form an angle of:

A) 120 degrees B) 125 degrees
C) 130 degrees D) 135 degrees
 
Answer & Explanation Answer: C) 130 degrees

Explanation:

Angle traced by hour hand in 12 hrs. = 360º.

Angle traced by it in  {\color{Black} \frac{11}{3}} hrs=  {\color{Black} \left ( \frac{360}{12} \times \frac{11}{3}\right )^{o}}={\color{Black}110 ^{o}}

Angle traced by minute hand in 60 min. = 360º.

Angle traced by it in 40 min. ={\color{Black}\left ( \frac{360}{60} \times 40\right )^{o}}={\color{Black}240^{o}}

 {\color{Black} \therefore } Required angle (240 - 110)º = 130º.

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Filed Under: Clock puzzles

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