56. At 1113 you are in the entrance to Great Salt Pond on Block Island with buoy «5» close aboard. What is your ETA at light «1» at the mouth of the approaches to Lake Montauk if you make good 9.6 knots?

The ETA at light «1» is 1301. The distance from buoy «5» to light «1» is approximately 17.3 nautical miles. At a speed of 9.6 knots, the elapsed time is approximately 1 hour and 48 minutes. Adding this elapsed time to the departure time of 1113 results in an ETA of 1301.