439 knots=505.192178 miles per hour
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1,760 yards = 1 mile 439 yards = 0.2494 mile (rounded) 440 yards = 1/4 mile, exactly
probably 9 and a 1/2 hours
439 ÷ 78 = 5 49/78 = 5.6282051282051... ≈ 5.628
0.0159
567-439 = 128