Thread 'How to find route if we only know velocity (without having popular formulas)?' Hi! I invented the issue and I check out to solve it: Allow we only know velocity of transferring particle: ##v(t)## from ##t=a## to ##t=b##. Simple to operate, it comes with a number of opening variants, https://gabletoppak.com/sustainability-in-action-gable-top-cartons-to-save-our-oceans/