Okay here goes! A boat "A" travels due north at a velocity of 18km/h , and a boat "B" travels south-east at 15km/h. a) Calculate the velocity of "A" relative to "B". b) If "B" is initially 30km north of "A", calculate the shortest distance between the two boats during the motion. Right, so I as able to work out a) by simply drawing my vector diagram and then using the cosine rule to calculate the Vab (velocity of A relative to B) to be: 30.51km/h Now what I can't figure out is how to place this new information given in b), I think its the phrasing that's tricking me, maybe. PLEASE HELP!! I just have to know how to do this one!