4024/21 Oct/Nov 2025, Question 19: Upper and lower bounds
Cambridge O Level Mathematics 4024 · Paper 21 (Calculator) · Calculator · 3 marks
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The question, in short
A car travels 320 km (to the nearest 10 km) in 5.2 hours (to the nearest 0.1 hour). Find the lower bound of its average speed.
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Solution · 3 marks
- 1Lower bound of distance = 315 km, upper bound of time = 5.25 hours
- 2Lower bound of speed = 315 ÷ 5.25
- 3= 60 km/h
Answer60
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