Average Speeds
The
Problem:
On a journey through
towns and country, a driver averages a speed of 18 mph for the 7 miles of town
driving, and 36 mph for the 14 miles of country driving. (Harder) On a faster stretch of road, the motorist averages 80 km/hr for 12 km, then 120 km/hr for 12 km. What is her overall average speed for this stretch ?
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