SOLUTION: traveling downstream a certain boat went 9km/h. traveling upstream it only went 1km/h. what is the speed of the current? how fast would the boat go if there were no current?

Question 497587: traveling downstream a certain boat went 9km/h. traveling upstream it only went 1km/h. what is the speed of the current? how fast would the boat go if there were no current?
Answer by htmentor(1343) (Show Source): You can put this solution on YOUR website!
traveling downstream a certain boat went 9km/h. traveling upstream it only went 1km/h. what is the speed of the current? how fast would the boat go if there were no current?
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Let s = the speed of the boat
Let c = the speed of the current
Downstream: s + c = 9
Upstream: s - c = 1
Subtract the 2nd from the 1st:
2c = 8
c = 4
The speed of the current = 4 km/h
If no current, s = 9 - 4 = 5 km/h
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