Question 601195
Boat speed	=	104	km/h									
current  speed	=	x	km/h									
												
speed against	current	104	-	x								
speed with	current	104	+	x								
												
Distance against	current	300	km									
Distance with	current	350	km									
												
t=d/r	time against = time with		current									
300	/	(	104	-	x	)=	350	/	(	104	+	x
300	(	104	+	x	)=	350	(	104	-x	)		
31200	+	300	x	=	36400	-	-350	x				
350	x	300	x	=	36400	+	-31200					
650	x	=	5200									
/	650											
x	=	8	km/h	current  speed								
												
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