Mathematics for IGCSE & O level - Limits Of Accuracy (Section 1 - No. 15)
Calculate, to 3 significant figures, the upper bound of the distance travelled for a speed of 57km/h for 2.5 hours (both values to 2 s.f.)
141 km
142.5 km
143 km
144 km
Explanation
Upper bound speed = 57.5 km/h. Upper bound time = 2.55 hours. Upper bound of distance = 57.5 * 2.55 = 146.6, which is 147km to 3 sig figs.
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