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Option H, 1.428 * 10^-3

Step-by-step explanation:

Step 1:  Convert 0.001429 into scientific notation

To have the number in scientific, you need to have to have a number then the decimal point then the rest of the numbers.

0.001429

1.429

Next, you need to find out what you multiply 1.429 to get 0.001429

1.429 * 0.001

1.428 * 10^-3

 Option H, 1.428 * 10^-3

- "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."

it would take 7/10 of an hour too fill the pool.

step-by-step explanation: