350/80 = 4.375 hours or 4 hours 22.5 minutes.
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The knot is a unit of speed equal to one nautical mile per hour. Therefore moving at 3 knots it would take 350/3 = 116.6666666666667 hours to go 350 nautical miles.
1 knot = 1.852 nautical miles per hour. So 45 knots = 83.34 nautical miles per hour. Time = Distance/Speed = 4.2 hours (approx).
350 miles divided by 5 hours is 70 miles per hour. 350 mi / 5hr = 70 mi/hr
If it flies at 350 miles per hour, then in three hours it will fly 350*3 or 1050 miles.
Average speed is usually a unit rate. So, if you travel 350 miles in 1 hour then that is said"350 miles per hour."