A begin to move from Point P. A goes toward 9m, Q then from Q to 7m, R. B begin to move from point O. B goes toward 3m, S then from S to 9m T, then from T to 5m U. ⇒ UR = QT – TB – UQ = AS – TB – UQ (QT = AS) = 9 – 2 – 4 = 3 m. Hence, B is 3m. to the east of A.