Water goes over niagara falls at the rate of 180 million cubic feet every 1/2 hour. how much water goes over the falls in 1 minute? answer in proportions

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)

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."

c

step-by-step explanation: