The high-speed train travelling from Xi’an to Chengdu is 95 m/s. Convert this speed into km/h.[1]
The distance from Xi’an to Chengdu is 658 km. By rounding the distance and the speed in part (a) to 1 significant figure, estimate the time taken for the high-speed train to travel from Xi’an to Chengdu.[1]
Without doing any further calculation, explain why the actual time is shorter than the answer to part (b).[1]
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Answer:(a) \(342\text{ km/h}\) (b) \(2\dfrac13\text{ h}\) (c) Distance rounded up and speed rounded down both increase the estimated time.