Gráinne is taking part in a training session. The graph shows the distance she travelled during the session. The four parts of the graph are labelled A, B, C, and D. (a) Write the letters A, B, C, and D into the table to match each description with the correct part of the graph. Description Gráinne runs for 20 minutes Gráinne stops for 15 minutes Gráinne walks for 10 minutes Gráinne stops for 5 minutes (b) Gráinne runs 4 km in 20 minutes at a steady pace. Find her speed in km per hour.

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Gráinne is taking part in a training session - Junior Cycle Mathematics - Question 8 - 2015

Question 8

Gráinne is taking part in a training session. The graph shows the distance she travelled during the session. The four parts of the graph are labelled A, B, C, and D.... show full transcript

Worked Solution & Example Answer:Gráinne is taking part in a training session - Junior Cycle Mathematics - Question 8 - 2015

Step 1

Gráinne runs for 20 minutes

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Answer

Step 2

Gráinne stops for 15 minutes

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Answer

Step 3

Gráinne walks for 10 minutes

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Answer

Step 4

Gráinne stops for 5 minutes

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Step 5

Find her speed in km per hour.

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Answer

To find the speed, we can use the formula:

$ext{Speed} = \frac{\text{Distance}}{\text{Time}}$

In this case, Gráinne runs 4 km in 20 minutes. First, we convert the time to hours:

$20 ext{ minutes} = \frac{20}{60} ext{ hours} = \frac{1}{3} ext{ hours}$

Now, we can substitute the values into the speed formula:

$ext{Speed} = \frac{4 ext{ km}}{\frac{1}{3} ext{ hours}} = 4 \times 3 = 12 ext{ km/h}$

Therefore, Gráinne's speed is 12 km/h.

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