User:Ceo14

About Me:

I am from West Des Moines, Iowa. I am studying (mechanical) engineering at Duke.

For fun

A 120 wire cable has been laid firmly underground between two telephone exchanges located 10km apart. Unfortunately, after the cable was laid it was discovered to be the wrong type: the individual wires are not labeled. There is no visual way of knowing which wire is which and thus connections at either end are not immediately possible.

You are a trainee technician and your boss has asked you to identify and label the wires at both ends without ripping it all up. You have no transport and only a battery and light bulb to test continuity, and tape and a pen for labeling the wires.

What is the shortest distance in kilometers you will need to walk to correctly identify and label each wire? (source: http://brainden.com/)