At noon, a ship leaves the harbor and sails south at 20 knots. Two hours later, a

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At noon, a ship leaves the harbor and sails south at 20 knots. Two hours later, a second ship leaves the harbor and sails at 10 knots. When will the ships be 400 nautical miles apart? Round to the nearest minute. Note that 1 knot = 1 nautical mile per hour.