Tiara wants to know the width of the given river. While doing so, she stands on the edge of the river and look straight across to a point on the other edge without changing the inclination of the neck and head. She turns side ways until the vision is in line with a point on the side of the stream.
From the above description, find the value of QR.
A 25 units
B 12 units
C 15 units
D Can't be determined
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