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+//Two ships
+//refer fig.14.8,14.9 and 14.10
+//Taking west direction as x-axis and north direction as y-axis
+//velocities in kmph are
+vAx=30*sind(30)
+vAy=30*cosd(30)
+vBx=40*sind(45)
+vBy=-40*sind(45)
+vrx=15-28.284
+vry=25.98-(-28.284)
+vr=sqrt((13.284^2)+(54.264^2))
+theta=atand((13.284)/(54.264))  //degree
+printf("\nFrom B, ship A appears to move with a velocity of %.2f kmph in N %.2f degree E direction",vr,theta)
+//relative distance after half an hour (drel)
+drel=55.866*(1/2)  //km
+printf("\nRelative distance after half an hour=%.2f km",drel)
+
+