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The following examples serve as a guide of how to use
the slide rule.
SPEED CALCULATION:
What speed is required to go 10 nautical miles in
15 minutes?
Known Factors: Distance: 10 nautical miles Time:
15 minutes
• Align "10" arrow on the outer ring with "15" on the
inner ring.
• The speed required can be found directly above the
"MPH" marking on the inner ring.
The answer: 40 nautical miles per hour
Time Calculation: How long will it take to go 10 nauti-
cal miles at a speed of 40 miles per hour?
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Known Factors: Speed: 40 miles per hour Distance:
10 nautical miles
• Align "40" on the outer ring with the mark "MPH"
marking on the inner ring.
• The time required can be found directly below the "10"
arrow on the outer ring, which is "15" on the inner ring.
The answer: 15 minutes
DISTANCE CALCULATION:
How far can you travel at 40 miles per hour for
15 minutes?
Known Factors: Speed: 40 nautical miles per hour Time:
15 minutes
• Align "40" on the outer ring directly above the mark
"MPH" on the inner ring.
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