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A clock area (Posted on 2023-08-23) Difficulty: 3 of 5
A clock has an hour, minute, and second hand, all of length 1. Let T be the triangle formed by the ends of these hands. A time of day is chosen uniformly at random. What is the expected value of the area of T?

No Solution Yet Submitted by Danish Ahmed Khan    
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re: Computer method - faulty premise | Comment 2 of 6 |
(In reply to Computer method by Larry)

"The problem is equivalent to placing 3 random  points on a unit circle"


This premise is wrong.  Given the position of the hour hand then the positions of the minute hand and second hand are set as a function of the hour hand.

If the hour hand is at angle T (measured clockwise from 12:00) then the minute hand is at angle 12*T and the second hand is at angle 720*T.

  Posted by Brian Smith on 2023-08-23 11:54:42
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