(1) How deep is a fathom?
Answer: 1.83 metres (6 feet).
(2) How many yards are there in a chain? (bonus: how many chains are there in a furlong?).
Answer: 22 (bonus: 10).
(3) What ancient unit of length was based on the distance from the elbow to the middle finger?
Answer: Cubit.
(4) What is a speed of 1.852 kilometres per hour?
Answer: One knot.
(5) A glean is a measure of 25 what?
Answer: Herrings.