PQR is an acute angled triangle whose circumcenter and the orthocenter are respectively located at X and Y. The length of the side RP is greater than length of the side PQ.

PY is extended to intersect the side QR at S and, ST is drawn perpendicular to XS such that ST intersects the side PQ at T.

Determine the measure of the Angle RQP, given that Angle SYT = 70^o.