A river of width 30 m flows in a straight line (the x direction) with a speed of 0.23 m/s. A boat is rowed such that it travels directly across the river (along y). If the boat takes exactly 4.0 minutes to cross the river, what is the speed of the boat relative to the water?
An airplane has a velocity relative to the air of 189 m/s in a westerly direction. If the wind has a speed relative to the ground of 53 m/s directed to the north, what is the speed of the plane relative to the ground?