A boat takes 2.6 hours to travel 28.43 km down a river, then 5.5 hours to return. How fast is the river flowing? So we want to find the velocity the river has. I'm not sure I even started this right. First I converted 2.6 hours to seconds = 9360 s Then 5.5 hours to seconds = 19800 s And 28.43 km to meters = 28430 m I then used the linear uniform motion equation (xf = xi + vi*t). Am I right in doing this, there is no gravity, correct? 28430 = vi*9360s ---> vi = 3.037 m/s 28430 = vi*19800 ---> vi = 1.436 m/s This doesn't seem right at all, I don't think I'm understanding the question completely.