Answer:
The quadrant in which point S lie is:
Quadrant 4.
since, the x-coordinate is positive and y-coordinate is negative
Explanation:
We know that if the point C(c,d) lies in between A(a,b) and B(a',b') then the coordinates of the point C is given by:

Here the midpoint of segment TS is the origin i.e. (c,d)=(0,0)
A=T and B=S
Also, Point T is located in Quadrant 2.
i.e. a<0 and b>0
We have:

Hence, we have:

This means that point S lie in quadrant 4