SOLUTION: Tinh can row at a rate of 6 mph in still water. It takes her 2 hours to row upstream from a dock to a park. She then rows back to the dock, and it only takes 40 minutes. What is th

Question 831798: Tinh can row at a rate of 6 mph in still water. It takes her 2 hours to row upstream from a dock to a park. She then rows back to the dock, and it only takes 40 minutes. What is the speed of the river current?
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
c = speed of the current.

_______________speed_______________time_____________distance
UP_____________6-c_________________2__________________d
DOWN___________6+c_________________2/3________________d

Same distance each way. Rate*Time gives the distance, and both expressions must be equal.
Forty minutes is the same as (2/3) hour. We can keep all in miles and hours.

Simplify and solve for c.

RESULT: mph
RELATED QUESTIONS
Amanda can row 32 miles downstream in 8 hours but it takes her 6 hours to row 12 miles... (answered by josgarithmetic)

a crew team can row 48 km downstream in 4 hours, but it takes 6 hours to row that same... (answered by josmiceli)

a man can row 20 km downstream in the time it takes him to row 8 km upstream. he rows... (answered by lwsshak3)

A girl rows upstream in the river that flows at the rate of 3 mph. It takes her 2 hours... (answered by stanbon)

Kate can row a boat 12 miles per hour in still water. in a river where the current is 6... (answered by josgarithmetic,stanbon,MathTherapy)

a man who can row 4 miles per hour in still water finds that it requires 6 1/2 hours to... (answered by josgarithmetic)

A man who can row 4 miles per hour in still water finds that it requires 6 1/2 hours to... (answered by josgarithmetic)

A man can row 20km downstream in the time he takes to row 8km upstream. He rows... (answered by Paul)

Glenn can row 7 mph in still water. If it takes him the same time to row 6 miles... (answered by Paul)