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+//ship approaching port
+//refer fig. 14.13 and 14.14
+//let west be x and north be y axes 
+//speed in kmph is 
+vBx=25*sind(45)
+vBy=25*cosd(45)
+vAx=-15
+vAy=0
+//Let vr be the relative velocity of B w.r.t. A
+vrx=17.678-(-15)  //kmph
+vry=17.678   //kmph
+vr=sqrt((32.678^2)+(17.678^2))  //kmph
+alpha=atand(17.678/32.678)  //degree
+t=(50*cosd(alpha))/(vr)  //hours
+//during this time A has moved in east by (da)
+da=15*1.1837  //km
+//and B has moved in N 45 degree W a distance (db)
+db=25*1.1837  //km
+printf("\nt=%.2f hours\nA has moved in east by da=%.2f km\nB has moved in N 45 degree W a distance db=%.2f km",t,da,db)
+
+
+
+