At 8:00 AM, two ships depart at the same time from different docks. Ship A is located 40 nautical miles due west of ship B. If ship A sails east at 20 knots and ship B sails north at 10 knots. a) At what time in the next 2 hours will the ships be closest together? b) What is the minimal distance between the 2 ships? (note: 1 knot = 1nm/h)