Answer:B
Step-by-step explanation:
Just did it on math nation
 
        
             
        
        
        
Answer:
80
Step-by-step explanation:
28×100÷35=80
 
        
             
        
        
        
Falling at the rate of 2.5 m/s for 45 seconds, the anchor fell
                                     (2.5 m/s) x (45 s)  =  112.5 meters .
If it wound up only 40 meters underwater, then it must have fallen 
                                      (112.5 m  -  40 m)  =  72.5 meters
from its storage position on the big cruise ship,  
before it ever reached the water. 
Since it was falling at the rate of  2.5 m/s, it took
                                     (72.5 m) / (2.5 m/s)  =  29 seconds
to get down to the water surface after it started dropping.