Upon a vessel's departure from point "A" at 1206, the counter reading was 616729. At midnight, the counter reading was 672889, at which time the engine speed was increased to 82 RPM, and remained the same speed until its arrival at point "B" at 1140 the following day. If the vessel is equipped with a 20 foot 8 inch diameter propeller, having a pitch of 20 feet, and apparent negative slip of 6.65% was calculated for the passage, what observed distance was covered?
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