Mathematics for IGCSE & O level - Limits Of Accuracy (Section 3 - No. 33)
A speed is calculated from a distance of 14.2 km (to 3 s.f.) and a time of 46 minutes (to the nearest minute). What is the greatest possible speed?
18.3 km/h
18.7 km/h
18.8 km/h
18.9 km/h
Explanation
The speed is calculated as distance/time. Therefore to maximise the speed, maximize the distance (14.25 km) and minimize the time (45.5 minutes). Upper bound speed = 14.25 km / 0.7583 hours. = 18.875 km/h (Which is 18.9 to 3s.f).
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