The river is wide

I have scientifically calculated that the River Ness, at this point is 33.3 double decker buses wide. Why 33.3? Apparently the average length of a double-decker bus is around 12 metres (35 feet), so if we assume that the river is around 400 metres wide at this point, then it would take a 33.3 double-decker buses to ford the river. Thank you. I think that's setted then.