Mathematics for IGCSE & O level - Limits Of Accuracy (Section 1 - No. 11)
Can cycles 14.2 km (to 3 significant figures) in a time of 46 minutes (to the nearest minute). What is the lower bound of his average speed in kilometers per hour?
18.3 km/h
18.4 km/h
18.7 km/h
18.8 km/h
Explanation
Lower bound speed = (Lower bound distance) / (Upper bound time) = 14.15 / (46.5/60) = 18.27, to 3 significant figures the correct answer is 18.3km/h
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