Answer:
6×10⁶ cubic feet
30:1
Step-by-step explanation:
Water goes over Niagara Falls at a rate of 180 million cubic feet every hours.
Now, 180 million cubic feet ≡ 18×10⁷ cubic feet
and hours =30 minutes.
As the water is falling at a constant rate, hence, the unitary method of calculation can be applied.
Therefore, in 1 minute, the amount of water that goes over the falls will be
18×10⁷/30 =6×10⁶ cubic feet.
So, the amount of water passing over the falls is reduced in the ratio 30:1. (Answer)