Question 548075
Boat speed		x	kph				
current speed 		4	kph				
..							
against wind   		x	-	4	kph		
with wind  		x   	+	4	kph		
							
Distance against 	current	24					
Distance with 	current	40					
Time = same	equate the time against with time with current						
t=d/r							
24	/(x-	4	)=	40	/(x+	4	)
24	*(x+	4	)=	40	*(x-	4	)
24	x  	+	96	=	40	x	-160
40	x  	-24	x   	=	160	+	96
16	x  	=	256				
/	16						
	x=	16	kph				
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