I don't think they are worth much. The Hot Wheels is a McDonald's toy and can be frequently found in "2-bit" boxes. I haven't seen a huge following for the small tootsies and have found them for anywhere from a quarter to up to a $1 or $2.
I've collected Tootsietoys and others off and on, for many years. Yours are from the 70's, and for some reason they never caught on with Tootsietoy Collectors. There are some 2 piece semi's in that series/scale that are worth collecting but most of the series are change, to a buck or two. Still nice, if you like them -