Verified Answer :

Hello! Let me see if I can help you!

So the basic equation for rate is r=d/t 
Plugging the numbers into the equation...(r=159/2 1/2)=(r=159/2.5)
Solving, we get 63.6!
So...our catamaran's rate of travel, or speed, is 63.6 MPH.

Please tell me if I helped you out!