I believe , there can't be an answer that can be called perfectcorrect for such situations.
I think saving more number of people by getting one k*ll3d seems more wiser to me.Logically , but in real life logic simply doesn't works that well.
Well you are right that there is no perfect answer for these questions
However the point here is I hope you answered even if you differ majority of society wants to do the following ( Its majority view
not the correct view):-
1) Turn the car and kill the single guy
2) Dont wanna push the fat man
3) Dont want to kill one to save rest
4) Dont want to kill one to save rest
You see how view changes lets twist the first question a bit
lets make that single person the president of India now?
or
Lets say that single man supports a family of 10 where these 5 people are bachelors and have no other family dependent whatsoever
Again you may think kill 5 as you believe in utilitarian view
like you believe we should have anti terrorist law so that even if 10 innocent die thousands could be saved
But you see as an individual you wanna kill somebody only when its inevitable like the car case but you don't wanna kill somebody innocent if
you have a choice State also thinks in same manner
State doesn't want to risk killing innocents
as with each innocent death people's faith in state decreases and anarchist becomes stronger
Hence state shall execute Kasab in due time but it will leave no stone unturned that later somebody could say justice was
denied to Kasab as he was "alleged" terrorist
Now that it has been proved that he is a terrorist, justice will be delivered
Hence killing of one to save 10 is only right till the time you are not that person who will be killed.
PS - If you are ever free see these videos not only they are damn interesting to watch but would give you a new perception of the world
Watch Episodes - Justice with Michael Sandel