40 km/h
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27 divided by 9 = 3 hours
3475 km / 5 hr = 695 km/h
She travelled 140 + 300 ie 440 km in 7 hours. Her average speed was 440/7 or just a hair under 63 kph.
Distance = Rate * Time or, for our purposes a little algebraic manipulation Rate = Distance/Time Rate = 200 km/5 hours = 40 kilometers per hour -----------------------------------
The average rate during those 4 hours is 83.5 km per hour.