R is a velocity measure, defined as a reasonable speed that is consistant with health, mental well being and not being more than five minutes late. It is, therefore, clearly an almost infinitly variable fingure accoridng to circumstances, since the first two factors very not only with speed taken as an absolute, but also with awareness of the third factors. Unless handled with tranquillity this equation can result in considerable stress, ulcers and even death.
WTF? Is that thing going at R17?