0580/21 May/Jun 2021, Question 20: Calculating with Bounds
Cambridge IGCSE Mathematics 0580 · Paper 21 (Extended) · Calculator · 3 marks
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The question, in short
Using a 600 km distance rounded to the nearest 10 km and a time of 8 hours 40 minutes rounded to the nearest 10 minutes, find the lower bound of the average speed in km/h.
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Solution · 3 marks
- 1Lower bound of distance = 600 − 5 = 595 km
- 2Upper bound of time = 8 h 40 min + 5 min = 8 h 45 min = 8.75 h
- 3Lower bound of speed = 595 ÷ 8.75
- 4= 68 km/h
Answer68
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