[ Mathematics ] Open Question : Precalc word problem help!!!?

A ship heads due south with the current flowing northwest. Two hours later, the ship is 20 miles in the direction of 30 degrees westsouth from the original starting point. The goal is to find the speed of the ship with no current and also find the rate of the current. Ship's speed with no current? Rate of the current?

Source: http://answers.yahoo.com/question/index?qid=20110425195928AAcMfFY

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