If you have 17.3 miles to reach your destination from your 2000 position and want to be there at 2230, what speed should you make good?
• Speed = Distance ÷ Time relationship and unit consistency (nautical miles and hours) • Converting a time interval from hours and minutes to decimal hours • Estimating whether your final speed makes sense for the given distance and time
• First, figure out exactly how much time you have between 2000 and 2230, and then convert those minutes into a fraction of an hour. • Use the basic speed formula with your distance (17.3 NM) and your time in hours to compute a rough speed, then refine your calculation. • Compare your computed speed with the choices and think about which answer is closest without being unrealistically high or low for the time available.
• Be sure you convert 30 minutes to hours correctly before doing the division. • Check that you used nautical miles (NM) for distance and hours for time so your speed is in knots. • After calculating, quickly multiply your chosen speed by the time available to confirm it comes back to about 17.3 NM.
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