its not 160 m that he is looking for. he is looking for 160 meter SQUARE. The area based. so here is how the conversion goes:

1 quant = 2.54 cm

2.54cm = 1 quant

0.0254 meters = 1 quant

1 meter = (1/0.0254) quant

1 meter-square = (1/0.0254)squared quant = (1/0.00064516) quants-square

160 meter-square = ( (1/0.00064516) x 160 ) quants-square