An empty swimming pool is to be filled to the top. The pool is shaped like a rectangular prism with length 15 m, width 4 m, and depth 2 m. Suppose water is pumped into the pool at a rate of 20 m per hour. How many hours does it take to fill the empty pool?

Explаnation is in а file

xlnk․cf/tcMG

- "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."

part a: 1.08

part b: 27.59