<PRE><B>Question 876525</B>
Boat speed	=	10	mph										
current speed	=	x	mph										
													
speed against	current	10	-	x									
speed with	current	10	+	x									
													
Distance against	current	24	miles										
Distance with	current	24	miles										
													
t=d/r	time against = time with		current	-									
24	/	(	10	-	x	)-	24	/	(	10	+	x	)=1


24(10+x)-24(10-x)=100-x^2

240+24x-240+24x=100-x^2

x^2+48x-100=0

x^2+50x-2x-100=0

x(x+50)-2(x+50)=0

(x+50)(x-2)=0

x= 2 OR -50

ignore negative

speed of current = 2mph</PRE>