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Typical Problems for River Current
1. Level 1  Well Stated
A boat travels downstream on a river at 60 km/h. It travels upstream on the same river at 40 km/h. What is the speed of the boat in still water and the speed of the current of the river? Assume that the speed of the boat in still water and speed of the current of the river are constant.
A boat travels downstream at 60 km/h and upstream at 40 km/h. With what speed would a raft move?
A boat went 15km downstream in 20 minutes and then upstream 50km in 2 hours. At what speed would a piece of driftwood move in this river? Assume that the speed of the boat in still water and speed of the current of the river are constant.

Click and drag the sliders to set: speed of boat in still water, speed of current and direction of boat.

Problem Solving Techniques
\left\{ \matrix{ \color{red}{x + y = 60} \cr \color{blue}{x  y = 40} \cr} \right. \Leftrightarrow \left\{ \matrix{ x + y = 60 \cr \color{purple}{2x + 0y = 100} \cr} \right. \Leftrightarrow \left\{ \matrix{ x + y = 60 \cr \color{purple}{2x = 100} \cr} \right.
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