Accordingly, how far could a sailing ship travel in a day?
For a faster ship 80-100 miles. Anything between 50-100 miles a day is reasonable enough. You might go to 120 miles/day or so for a good ship in good conditions - that's an average 5 mph in the intended direction, which is about the highest plausible number pre-Age of Sail.
Also, how many miles can a boat travel on one tank of gas? If you are talking about an average sailing yacht between 35–45ft in length, calm sea state, no overrevving the engine, etc. I would calculate with 1 liter/hour with a cruising speed about 4 knots. Given a (regular) tank volume of 100 liters, that would give you about 400 miles.
Secondly, how long does it take to travel 1 mile by boat?
One nautical mile equals 1.15 statue miles. If it takes someone an hour to travel 45 miles, they must have averaged 45 mph. The same concept applies to a vessel. A ship averaging 20 knots would go 20 nautical miles in one hour or 200 miles in 10 hours.
How fast can a small sailboat go?
Most sailboats cruise at a speed of 4-6 knots (4.5-7 mph), with a top speed of 7 knots (8 mph or 13 km/h). Larger racing yachts can easily reach speeds up to 15 knots (17 mph or 28 km/h), with an average cruising speed between 6-8 knots (7-9 mph).