The second windsurfer is going faster cuz 5 meters = 16.4042.
        
             
        
        
        
Since you need a little bit of trigonometry to solve this problem, 
I'm pretty sure you've had a little bit of trigonometry in class before 
you were assigned to solve this problem.
-- The shaded triangle comes from taking the equilateral triangle and 
either folding it in half or cutting it in half.
-- The base that the new triangle is standing on is 1/2 the base of the 
equilateral triangle, so it's 7 cm long.
-- The acute angle at the right end of the base is the same as it was in 
the equilateral triangle . . . 60 degrees.
--  The tangent of 60 degrees is (opposite side)/(adjacent side) = x / 7 cm
              tan(60) = x/7
-- Multiply each side of this little equation by 7 :   7 tan(60) = x
 
If you don't have the tangent of 60 degrees in your pocket, you can 
find it with your calculator.  Multiply it by 7, and Shazam, you know 'x' .
        
             
        
        
        
I think it’s 140 I hope this helps