Distance-time graphs
2 marks · NormalA train travels at an average speed of 30 m/s. How far does it travel in 12 minutes? Give your answer in kilometres.
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21.6 km (±0.1)
Also accept: 21600 m
Common mistakes: failing to convert minutes to seconds; giving the answer in metres only
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Marking points
M1 · 1 mark · Converts 12 minutes to seconds (12 × 60 = 720 s). Uses distance = speed × time.
A1 · 1 mark · Gives correct distance in km: 21.6 km.
Worked solution
12 min = 720 s. Distance = 30 m/s × 720 s = 21,600 m = 21.6 km.