Graphs 3

3 marks · Normal

A train travels at a constant speed for 45 minutes and covers a distance of 54 km.

Calculate the speed of the train in km/h.

Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.

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72 km/h (±0.5)

Common mistakes: Not converting 45 minutes to hours, or using 45 as hours.

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Marking points

M1 · 1 mark · Converts 45 minutes to 0.75 hours.

M1 · 1 mark · Uses correct formula: speed = distance/time.

A1 · 1 mark · Correct final answer of 72 km/h.

Worked solution

Time in hours = 45 min / 60 = 0.75 h.

Speed = Distance / Time = 54 km / 0.75 h = 72 km/h.