0580/23 May/Jun 2023, Question 23: Upper and Lower Bounds
Cambridge IGCSE Mathematics 0580 · Paper 23 (Extended) · Calculator · 4 marks
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The question, in short
Using a 220 km distance and 125 km/h speed, both rounded, find the upper bound of the journey time and give it in hours and minutes.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 4 marks
- 1Upper bound distance = 220.5 km, lower bound speed = 122.5 km/h
- 2Upper bound time = 220.5 ÷ 122.5 = 1.8 hours
- 30.8 × 60 = 48 minutes
- 4= 1 h 48 min
Answer1h 48 min
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