7x6 bc its 7in in the desighn 
        
                    
             
        
        
        
Answer:
answer = 12.87 km/h
Step-by-step explanation:
Given 
 Ship A is sailing east at 25 km/h = 
ship B is sailing north at 20 km/h =
here x and y are the  sailing at t = 4 : 00 pm for ship A and B respectively 
so we get  x = 4 ×25 =100 km/h
                  y = 4× 20 = 80 km/h
let z is the distance between the ships, we need to find  at t = 4 hr
 at t = 4 hr
At noon, ship A is 130 km west of ship B (12:00 pm)
so equation will be 


derivative first equation w . r. to t we get 



![\frac{dz}{dt} =\frac{1}{z}[(x -130)\frac{dx}{dt} +y\frac{dy}{dt}]](https://tex.z-dn.net/?f=%5Cfrac%7Bdz%7D%7Bdt%7D%20%3D%5Cfrac%7B1%7D%7Bz%7D%5B%28x%20-130%29%5Cfrac%7Bdx%7D%7Bdt%7D%20%2By%5Cfrac%7Bdy%7D%7Bdt%7D%5D)

      
 
        
             
        
        
        
19-y because you are taking away y from 19
        
                    
             
        
        
        
This question tells that the sky ride is a rectangle. 
This means the perimeter or the total distance round the figure = 2L + 2B
= 2(4)+ 2(10)
=8+20
=28 feet
Anna rose 7 times
Distance rode= 7(28)
 =196 feet