Tina worked on this problem: " A river barge can travel 9 mi/hr in still water. It takes the same amount of time for the barge to travel 8 mi upstream as it does to travel 12 mi downstreams. How fast is the current?" she chose s to represent the speed of the current wrote the equation for the times as and solved to get x=27. Is Tina's answer reasonable? If not, explain her error and correct it. If the correct, explain why. Show ur work