Answer:
37.76 minutes (Approximately)  
Step-by-step explanation:
Given: It takes a hose 5 minutes to fill a rectangular aquarium 11 inches long, 13 inches wide, and 14 inches tall.
To find: Time taken to fill an aquarium measuring 21 inches by 24 inches by 30 inches.
Solution: We know that volume of a rectangular prism is 
So, volume of rectangular aquarium measuring 11 inches long, 13 inches wide, and 14 inches tall is  cubic inches.
 cubic inches.
It is given that the hose take 5 minutes to fill the aquarium. 
So, we can say that 2002 cubic inches is filled in 5 minutes. 
Therefore, in 1 minute  cubic inches is filled.
 cubic inches is filled.
Now, volume of the aquarium measuring 21 inches by 24 inches by 30 inches is  cubic inches.
 cubic inches.
So, time taken to fill 15120 cubic inches
 
 
 minutes (Approximately)
 minutes (Approximately)