@slenn, i gues but my point is that(i just like the concept, realy so i try to understand it) and if the sisters neaded to build the time machine they would have arived at whatever point they neaded to be threre, although i made the asumption that this time machine igores paradoxes as altering history could stop the sisters creation, therefire making them void and there adventure void, but would also re creat them as that would not have had a chance to happen as the sisters wernt there to travel back in time in the first place, creating a infine loop
Your theory: lets say at point 11 the sisters started construction of the time machine, they intended to travel to point 1(current location/time), they finish construction at point 14, they arive at point 4. they took X amount of time to construct the machine, so they were delayed X amount of time from there idea destination on the timeline.
11_14=X 1_4=X . 11_1, to get to 1 from the inital point of 11, X would have to be added, 11_1+X=14_4.
(key) _=to, w=with
My corrected theory*:lets say again at point 11 the sisters started construction of the time machine, they intended to travel to point 1(current location/time), they finish construction at point 14, although this time they arive at point 1. this is posible as theycould change time and either 1)go back to that loaction/time imediatly, or 2) they travel back to point 11 and leave the time machine there, therefor altering X in the equation.
11_14+X_11(X is removed as with origional 14) 11wX_1
*to the best of my undestanding and current knowledge
-if we ignore the paradoxity of the time travel, this makes sense
thats my theory on it at least