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The average during that period of time is 20 km/hour west .
She travelled 140 + 300 ie 440 km in 7 hours. Her average speed was 440/7 or just a hair under 63 kph.
Its average speed during that period of 3 hours is 182.27 feet per second. (rounded)
If you average 8 hours per night during that period, then you've slept away 25 years.
136 set by some kid in first period a few years ago