Answer:
11.5 mi/h
Step-by-step explanation:
You want to know the average velocity if a distance of 46 mi is covered in 4 hours.
Speed
Speed is the ratio of distance to time:
speed = (46 mi)/(4 h) = 11.5 mi/h
__
Additional comments
"Velocity" is a vector that combines speed with direction. No direction is given here, so all we can compute is the speed.
If we assume the boat ended the trip at the dock where it started, then its displacement is 0 and so is its average velocity.
A trawler typically will travel no faster than 4.6 mph (4 knots). Baits and lures are usually trolled no faster than 9 mph.