A man travels on train and jumps from one place to another , at which speed he travels?

Question

he is jumping at that time the train is also moving but how he can jump to another place,

Answer 1

As Einstein would probably ask: Who is measuring and where is he/she?

If the guy measuring is also in the train, then the speed of the jump is just the speed of the jump.
If the guy measuring is outside the train, then he will see the man jumping at the speed of the jump + speed of the train. That is kindda how the Theory of Relativity came about.

Answer 2

If he is jumping out of the train, the speed at which he travels is just the speed of the train because the jump is perpendicular to the train.

If he is jumping out of the train from the top of the last coach or from one place to another place opposite to the direction in which the train is moving then the speed at which he travels will be:

speed of the train - speed of jump

If he is jumping from one part to another part in the same direction in which train is moving then the speed at which he travels will be:

speed of train + speed of jump

Answer 3

If he jumps in the direction the train is traveling, you add the speed of the jump to the speed of the train. If he jumps in the opposite direction you subtract it.

Answer 4

does he jump out of the train onto the ground? or jump from one part of the train to another part of the train? If he's jumping out of the train he is traveling at the speed of the train.