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+//ship B approaching port
+//refer fig. 14.15 and 14.16
+//Considering west as x-axis and south as y-axis
+vAx=24*cosd(30)
+vAy=24*sind(30)
+vBx=-18
+vBy=0
+//Let relative velocity of A w.r.t. B be vr at an angle alpha to western direction
+vrx=vAx-vBx  //kmph
+vry=vAy-vBy
+v=sqrt((vrx)^2+(vry)^2)  //kmph
+alpha=atand(vry/vrx)  //degree
+//Holding B stationary and allowing A to move with relative velovity,BC is given by
+BC=60*sind(alpha)  //km
+//from triangle BCD
+DC=sqrt((25^2)+(17.735)^2)  //km
+CE=DC  //km
+AC=60*cosd(alpha)  //km
+AD=AC-DC  //km
+AE=AC+CE  //km
+//Time taken to reach D
+t1=39699*60/40899  //min
+//time taken to reach E
+t2=74939*60/40599  //min
+printf("\nThe two ships can start exchanging signals %.2f min after ship A leaves the port and continue to do so for %.2f min",t1,t2-t1)
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