Instractions:-

Here U stands for waves velocity and v for boats' . Well i hope you can understand it by watching the pic besides it . Don't put different value like that of km/h and m/s in v or u .. or you may get wrong answers . and i won't held accountable for that! And as for X/Dot-multiplier please don't put numbers as i j k ... since it's not for matrix :( If you see any bugs please inform me .. I will fix that !