Question 857644
boat   	speed	=	7	km/h														
current     	speed	=	x	km/h														
																		
against 	current	=	7	-	x													
with 	current	=	7	+	x 													
																		
Total distance =		45	miles 		Total Time=	14.00	hours  											
Time upstream + time downstream =						14	hours  											
																		
45	/(	7	-	x 	)+	45	/(	7	+	x 	)=	14						
45	(	7	+	x 	)+	45	(	7	-	x 	)=	14.00	(	49	-	1	X^2	)
315	+	45	x	+	315	-45	x  	=	686	-	14	X^2						
630	-	-686	=			-14	X^2											
-56	=		-14	X^2														
-14	X^2=	-56																
X^2	=	4																
X =	+/-	2																
speed of boat = 2km/h