Explanation:
the volume of a rectangular prism is
length × width × height
it takes the hose 4 minutes to fill
10 × 11 × 13 in³ = 1,430 in³
the filling rate (ratio) is therefore
1430/4 in³/minute
the other volume is
25 × 28 × 30 in³ = 21,000 in³
since we are using the same hose (water supply), the filling rate of the larger aquarium (21000 in³ in x minutes) must be the same as the filling rate of the smaller aquarium :
21000/x = 1430/4
multiplying both sides by 4 and by x
21000 × 4 = 1430x
84000 = 1430x
x = 84000 / 1430 = 58.74125874... minutes
≈ 59 minutes