A boat can cover 12 km up the stream and 75% of that distance down the stream in 8 hours. Find the speed of the boat in still water if the speed of the stream is 41 2/3 meters per minute.
+36916 s = still water speed 41 2/3 m/min = 2.5 km hr
s+2.5 = downstream speed for 9 km
s- 2.5 = upstream speed for 12 km
12 / (s-2.5) + 9 / ( s+ 2.5) = 8 solve for 's' can you take it from here?
