8u=3u+35
You are solving equations with Variables on Both Sides.
Manuel has a boat that can move at a speed of 30 kn/h in still water. He rides 280 km downstream in a river in the same time it takes to ride 70 km upstream. What is the speed of the river?
2 answers
Let R = speed of river
Distance = rate * time
Therefore time = Distance/rate
280/(30+R) = 70/(30-R)
Solve for R.
Distance = rate * time
Therefore time = Distance/rate
280/(30+R) = 70/(30-R)
Solve for R.