The graph of the linear equation x + 3y = 1.5 is a straight-line intersecting x-axis and y-axis at the points P and Q respectively. P(3/2, 0) and Q(0, 1/2) are two points on the sides OP and OQ respectively of ΔOPQ, where O is the origin of the coordinate system. Then PQ = ?
1
√2 cm
2
√2.5 cm
3
4 cm
4
√5 cm