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

When it's bad luck to meet a black cat?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

Once upon a time, there was a castle on a square island. The entire island was surrounded by a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.

The Romans still managed to cross the trench. How did they do it?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

A person was found dead on a big green land with no trees or buildings around. When the police arrived, they found a piece of rock lying next to him and the man was wearing clothes comprising of red, blue and yellow colours.

Can you tell who the person is and what was the cause of death?

I am the fastest animal but cannot climb the tree. What am I?

By what process could you make a 'Tea-Table' into food?

You know three triplets: Frank John and Wayne (need to return your money). Frank always tells the truth while John and Wayne always lie. You meet one of them on the road and can ask him a three-word question.
Which question, will you ask?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?