WEEKLY PUZZLE

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This Week's Puzzle

A glass of water with a single ice cube sits on a table. When the ice has completely melted, will the level of the water have increased, decreased or remain unchanged?

Last Week's Puzzle

Fastest Fingers for Last Week

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Week : 2018-10-05 to 2018-10-12

Puzzle :

Dr. DoLittle always goes walking to the clinic and takes the same time while going and while coming back.
One day he noticed something. When he left the home, the hour hand and the minute hand were exactly opposite to each other and when he reached the clinic, they were together. Similarly, when he left the clinic, the hour hand and the minute hand were together and when he reached the home, they were exactly opposite to each other.
How much time does Dr. DoLittle take to reach home from the clinic? Give the minimal possible answer.


Correct Solution : 32 minutes 43.6 seconds

Solution Tips :

In twelve hours, the minute hand and the hour hand are together for 11 times. It means that after every 12/11 hours, both the hands are together. Similarly in twelve hours, the minute hand and the hour hand are exactly opposite to each other for 11 times. It means that after every 12/11 hours, both the hands are opposite. Now, let's take an example.
We know that at 12 both the hands are together and at 6 both the hands are exactly opposite to each other. After 6, both the hands are in opposition at [6+(12/11)] hours, [6+2*(12/11)] hours, [6+3*(12/11)] hours and so on. The sixth such time is [6+6*(12/11)] hours which is the first time after 12. Thus after 12, both the hands are opposite to each other at 12:32:43.6.
Hence, Dr. DoLittle takes 32 minutes and 43.6 seconds to reach home from the clinic.


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