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TP & TQ are the two tangents on the circle.
Therefore , <OPT and <OQT are 90 degree angles (Tangents are perpendicular to angles from it's center)
Therefore in the quadrilateral TPOQ,
<PTQ = 360 -(90 + 90 + 120)
<PTQ = 360 - 300
<PTQ = 60 degree
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