General Idea:
The volume of cylinder is given by  , where r is the radius and h is the height of the cylinder.
, where r is the radius and h is the height of the cylinder.
Applying the concept:
Step 1: We need to find the volume of full cylinder with the given dimensions using the formula. 
Volume of full cylinder 
Volume of half cylinder 
Step 2: Let x be the number of minutes of filling the sand.
 of sand filled every 15 seconds, there are four 15 seconds in a minute.
 of sand filled every 15 seconds, there are four 15 seconds in a minute.
So volume of sand filled in 1 minute .
.
 of sand taken out of cylindrical vase every minute.
 of sand taken out of cylindrical vase every minute.
Net volume of sand filled in 1 minute = Volume of sand filled in the vase in one minute - Volume of sand taken out in 1 minute
Net volume of sand filled in 1 minute
Volume of sand filled in x minutes  .
.
We need to set up an equation to find the number of minutes need to fill half the volume in cylindrical vase. 

Conclusion:
The number of minutes required for the base be half filled with sand is 57
 
        
             
        
        
        
 <h3><u>Given</u>:-</h3>
- Volume 6,900 cm^3
- Length = 23 cm
- Width = 10cm
<h3><u>To Find</u>:-</h3>
<h3><u>Solution</u>:-</h3>


Where,
- » l denotes Length 
- » w denotes Width
- » h denotes Height







Therefore , the Volume of the Box is 30 cm ³.
 
        
        
        
The answer for this problem is t ≥ - 12