Question 347521
Upstream Trip:



rate = x + 3



time = 2



distance = 12



Downstream Trip:



rate = x - 3



time = 2



distance = 12



Let x = speed of boat in still water



2(x + 3) + 2(x - 3) = 12



2x + 6 + 2x - 6 = 12



4x = 12



x = 12/4



x = 3 miles per hour