Hello, Gordon, and welcome back to Just Answer.
The speed of the ship was 18 knots per hour. Here is a website that describes the ship in detail: http://www.clydesite.co.uk/clydebuilt/viewship.asp?id=15029 This site also has a photo of the ship and gives a history of her up until her sinking from being hit by a German submarine torpedo on 6/11/1916.
I hope this answers your question, but if you need more information please let me know.
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