Use a modification of the Cristian Algorithm. 
Start from the faulty clock.
Go to the accurate clock, get a time sample T, come back.
Set the new time as T + RTT* K/(1 + K), just choose a ratio K which 
represents the ratio of the time taken between going downhill and uphill

It's a famous distributed systems algorithm for clock synchronization in the 
presence of an authoritative time source.
http://en.wikipedia.org/wiki/Cristian's_algorithm 

--
DK
http://twitter.com/divyekapoor
http://www.divye.in

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