SOLUTION: Going down the river a boat went 11 mph. Going up the river it only went 3 mph. What is the speed of the current? How fast would the boat go if there were no current?

Question 404102: Going down the river a boat went 11 mph. Going up the river it only went 3 mph. What is the speed of the current? How fast would the boat go if there were no current?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
Going down the river a boat went 11 mph.
Going up the river it only went 3 mph. What is the speed of the current? How fast would the boat go if there were no current?
:
Let s = speed in still water
Let c = speed of the current
:
Two equations, use elimination here
s + c = 11
s - c = 3
---------------Addition eliminates c find s
2s = 14
s = 7 mph in still water

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