Paint is red : blue in a ratio of 2 : 4. if 5 litres of red is used how much blue is used

10 litres because in the ratio 2:4

                                                 ↑ Four is double the 2

So this tells us that there is twice as much red paint as there is blue paint. And if there is five litres of red paint then double that is 10, so there is ten litres of blue paint.

- "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."

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step-by-step explanation: