How many times in a day, are the hands of a clock in straight line but opposite in direction?

A) 20 | B) 22 |

C) 24 | D) 48 |

Explanation:

The hands of a clock point in opposite directions (in the same straight line) 11 times in every 12 hours. (Because between 5 and 7 they point in opposite directions at 6 o'clcok only).

So, in a day, the hands point in the opposite directions 22 times.

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Subject: Clock puzzles

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 |

Explanation:

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

Angle traced by hour hand in 5 hrs 10 min. *i.e., hrs *= = 155º

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Subject: Clock puzzles

A watch which gains uniformly is 2 minutes low at noon on Monday and is 4 min. 48 sec fast at 2 p.m. on the following Monday. When was it correct?

A) 2 p.m. on Tuesday | B) 2 p.m. on Wednesday |

C) 3 p.m. on Thursday | D) 1 p.m. on Friday |

Explanation:

Time from 12 p.m. on Monday to 2 p.m. on the following Monday = 7 days 2 hours = 170 hours.

The Watch gains min. or min.in 170 hrs.

Now, min.are gained in 170 hrs.

2 min.are gained in hrs=50 hrs

Watch is correct 2 days 2 hrs. after 12 p.m. on Monday *i.e.,* it will be correct at 2 p.m. on Wednesday

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Subject: Clock puzzles

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 |

Explanation:

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

Angle traced by it in hrs= =

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

Angle traced by it in 40 min. ==

Required angle (240 - 110)º = 130º.

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Subject: Clock puzzlesHow many minutes is it until six o’clock if fifty minutes ago it was four times as many minutes past three o’clock?

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Subject: Clock puzzles