SOLUTION: Clark has a boat that can travel at 15 kph in still water. It can go 140km with the current at the same time it takes to travel 35 km against the current. What is the speed of the

Question 377467: Clark has a boat that can travel at 15 kph in still water. It can go 140km with the current at the same time it takes to travel 35 km against the current. What is the speed of the river? (Discuss how you find the solution)
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
Let r = speed of current.
Then 15 - r = clark's speed against the river,
15 + r = clark's speed with the current. Then
, using the formula T = D/R.
140(15-r) = 35(15 + r),
2100-140r = 525 + 35r,
1575 = 175r,
r = 9 km/hr, the speed of the river.
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