Question

can distance and displacement be the same if so give example ? and can displacement be zero

Answer 1

yes distance and displacement can be same .
Eg: When an object os moving in a straight line.
And yes displacement can be zero when the object moves from a point and again comes back to the same point.

Answer 2

Yes distance and displacement can be the same if the direction component of the object's velocity is constant. For example, if a car moves in a straight line without changing direction or doubling back, the distance and displacement is same. 
Yes, displacement can be zero when a body is moving in a circular path and the body returns back to the initial position.