Table:
text: Persian units of measurement
Ancient Persian units
Length
Persian_unit Persian_name Relation_to_previous_unit Metric_Value Imperial_Value_
finger aiwas  ≈ 20 mm ≈ 0.8 in
hand dva 5 aiwas ≈ 100 mm ≈ 4 in
foot trayas 3 dva ≈ 300 mm ≈ 1 foot
four-hands remen 4 dva ≈ 400 mm ≈ 16 in
cubit (five-hands) pank`a dva 5 dva ≈ 500 mm ≈ 20 in
great cubit (six-hands) (k)swacsh dva 6 dva ≈ 600 mm ≈ 2 ft
pace pank`a 5 trayas ≈ 1.5 m ≈ 5 ft
ten-foot daca trayas pank`a ≈ 3 m ≈ 10 ft
hundred-foot chebel 8 daca trayas ≈ 24 m ≈ 80 ft

Question: What is the length of four hands in the metric system in Persian units of measurement?