# SOLUTION: Juniors boat will go 15miles per hour in still water.If he can go 12miles downstream in the same amount of time as it takes to go 9 miles upstream,what is the speed of the current?

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 Question 375606: Juniors boat will go 15miles per hour in still water.If he can go 12miles downstream in the same amount of time as it takes to go 9 miles upstream,what is the speed of the current?Answer by mananth(12270)   (Show Source): You can put this solution on YOUR website!let speed of current be x mph speed of boat in still water = 15 mph .. downstream speed = x+15 upstream speed = 15-x .. downstream distance = 12 miles upstream distance = 9 miles. ... t= d/r .. upstream time = downstream time 12/(x+15)= 9/(15-x) 12(15-x)=9(x+15) 180-12x=9x+135 21x=180-135 21x=45 /21 x= 45/21 x= 2.14 mph speed of current .. m.ananth@hotmail.ca