86. You are enroute to assist vessel A. Vessel A is underway at 6 knots on course 133°T, and bears 042°T, 105 miles from you. What is the time to intercept if you make 10 knots?

To intercept the vessel, match its perpendicular velocity (approximately 6 knots), leaving 8 knots to close the range. The time to intercept is the distance (105 nautical miles) divided by the closing speed (8 knots), resulting in approximately 12 hours and 58 minutes.