1 knot = 1 nautical mile per hour
time = distance / speed
→ time = 150 nm / 31 nm/hr ≈ 14.52 hr ≈ 14 hours, 30 minutes, 58 seconds.
3 hours
About 10.41 days at 6 knots.
Knots (not Knots per hour) are nautical miles per hour. So the answer is 902 divided by 7 which is 128.86 hours
11½ days
2½ days
14 hours 44 minutes.
14 days and 14 hours.
One hour.
1375 divided by 22 = hours
1500/11 hours
36/14 hours
No way to tell. Knots is a measurement of speed, nautical miles is distance. 16 knots is 16 nautical miles/hour, so it'd depend on how long the craft would keep going.