In the figure below, OABC is trapezium. AB is parallel to OC and OC=5AB. D is a point on OC such that OD:DC=3:2.(a) Given that OA=p and AB=q, express in terms of p and q:(i) OB(ii) AD(iii) CB(b) Lines OB and AD intersect at point X such that AX=kAD and OX=rOB, where k and r are scalars. Determine the values of k and r.