Answer:
okkk
Step-by-step explanation:
 
        
             
        
        
        
 Height of the water increasing is at rate of  
<h3>How to solve?</h3>
With related rates, we need a function to relate the 2 variables, in this case it is clearly volume and height. The formula is:

There is radius in the formula, but in this problem, radius is constant so it is not a variable. We can substitute the value in:

Since the rate in this problem is time related, we need to implicitly differentiate wrt (with respect to) time:

In the problem, we are given  
  
So we need to substitute this in:

Hence,  Height of the water increasing is at rate of  
<h3>Formula used: </h3>

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Answer:
D
Step-by-step explanation:
4-90m+70
74-90m so 
D
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