# Clock Hand Tips

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Accurate clocks set to the same time are on display in a clock shop. The sum of all the pairwise distances between the tips of the second hands ("tip distance sum") minus the sum of all the pairwise distances between the centers of the clock faces ("center distance sum") is graphed. Change the time using the "time" slider. Rearrange the position of the clocks by dragging them or clicking inside the display area. Add new clocks (up to 20) by holding down the Alt key and clicking in the display area.

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Contributed by: Noel Patson (March 2011)

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

The puzzle, "Clock Shop", was taken from [1].

Reference

[1] I. Guo, "Puzzle Corner 20," *Australian Mathematical Society Gazette*, 37(5), 2010 p. 287. http://www.austms.org.au/Publ/Gazette/2010/Nov10/37(5)Web.pdf.

## Permanent Citation

"Clock Hand Tips"

http://demonstrations.wolfram.com/ClockHandTips/

Wolfram Demonstrations Project

Published: March 7 2011