What begins with T, ends with T, and has T in it?

Count the Triangle in the figure given below:

What is the Surname of Barbie Doll?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

John, Jack and Jill are in a desert. John doesn't like Jill and hence decides to murder him. He poisons the water supply of Jill. Since it is a desert area, Jill must drink or he will die of thirst.

Jack does not know of the actions of John and also decides to murder Jill. To succeed in his ill motives, he removes the water supply of Jill so he dies of thirst.

Jill dies due to thirst. Who murdered Jill?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

Which alphabet letter is a question?

Which is the rope you never skip with?

John is found dead in a bare field. Nobody killed John,
John did not commit suicide.

Inspector Jacob found a bag just a few meters away from John which could save his life. What was in the bag?