0580/22 Feb/Mar 2023, Question 21: Calculating with Bounds
Cambridge IGCSE Mathematics 0580 · Paper 22 (Extended) · Calculator · 3 marks
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The question, in short
Using a 14 km distance and 12 minutes, both rounded to the nearest unit, find the lower bound of the car's speed in kilometres per minute.
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Solution · 3 marks
- 1Lower bound of distance = 14 − 0.5 = 13.5 km
- 2Upper bound of time = 12 + 0.5 = 12.5 min
- 3Lower bound of speed = 13.5 ÷ 12.5 = 1.08 km/min
Answer1.08
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