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A man drove from 7.45 am to 9.15 am (on the same day) and covered 84 kilometer. Then his driving speed is ______ km/h.
Correct Answer: 56
The drive lasted from 7.45 am to 9.15 am, which is 1 hour 30 minutes, or $$1.5$$ hours. The speed is therefore $$\frac{84}{1.5} = 56$$ km/h.
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