Three workers produce 1500 cans in 4 days. how many days can four workers produce 4000 cans? a)11
b)10
c)9
d)8

1500 cans / 3 workers = 500 cans per worker.

1 worker makes 500 cans in 4 days.

4 workers x 500 cans = 2000 cans in 4 days.

2000 x 2 = 4000 cans, 4 days x 2 = 8 days.

It will take 8 days.

- "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."