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- Q403 - Navigation Problems: Chart Plot
27. At 1227, on 19 October, you pass under the Greenville Highway Bridge (mile 531.3 AHP). What speed must you average to arrive at Jimmy Hawken Light (mile 663.5 AHP) at 0930 the following day?
The correct average speed is 6.3 mph, calculated by dividing the 132.2-mile distance between the bridges by the 21.05-hour time interval.
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