Two speedboats are traveling at the same speed relative to the water in opposite directions in a moving river. An
observer on the riverbank sees the boats moving at 4.2 m/s and 6.7 m/s. (Due to the nature of this problem, do not use rounded intermediate values in your calculations—including answers submitted in WebAssign.)
What is the speed (in m/s) of the boats relative to the river?
How fast is the river moving (in m/s) relative to the shore?