What is the perimeter of a rectangle 3m x 1.5m?

9 meters

The perimeter (distance around the outside) = length + width + length + width

P = 2L + 2W

2 (3) + 2 (1.5) = 6 + 3 = 9

also:

P = 2 (L + W)

2(3 + 1.5) = 9