At noon ship A is 50 nautical miles due west of ship B Ship A is sailing west at 23 knots and ship B is sailing north at 24 knots How fast in knots is the distance between the ships changing at 7 PM Note 1 knot is a speed of 1 nautical mile per hour Note Draw yourself a diagram which shows where the ships are at noon and where they are some time later on You will need to use geometry to work out a formula which tells you how far apart the ships are at time t and you will need to use distance velocity time to work out how far the ships have travelled after time t