Question 481120
boat  	speed	=	5	kmph			
current speed 		=	x	kmph			
							
upstream speed 		=	5	-	x 		
downstream speed 		=	5	+	x 		
							
Total distance =		3	km		Total Time=	1.25hours 

3	/(	5	-	x 	)+	3	/(	5	+	x 	)=	1.25	
3	(	5	+	x 	)+	3	(	5	-	x 	)=	1.25	
15	+	3	x	+	15	-3	x  	=	1.25		(	15^2-x^2)	
30	=	1.25	(	25	-	x^2	)						
30	=	31.25	-1.25	X^2									
X ^2	=	1.25											
X^2	1												
x=	1	km/h											
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