 In the simple case you look at the two acts open to you: meet your friend or aid the accident victims. Meeting your friend is prima facie right because it comprises keeping your promise, but prima facie wrong because it involves failing to maximise general good (in your circumstances). Helping the accident victims is wrong to the extent it involves breaking a promise, but right because it involves benefitting the victims. Ross says while there are no general rules ‘[f]or the estimation of the comparative stringency of . . . prima facie obligations’ (RG 41), his judgement is on reflection saving the accident victims is weightier than keeping your promise (RG 18), in which case, of the two acts, aiding the accident victims has on balance more prima facie rightness. Helping the accident victims is, then, all things considered, what you ought to do and therefore it is the right act – your actual duty – of those open to you.