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The efficiency e (in %) of an automobile engine is given by e = 0.7685 - 0.00004s', where s is the speed (in km/h) of

The efficiency e (in %) of an automobile engine is given by e = 0.7685 - 0.00004s', where s is the speed (in km/h) of the car. Find the average efficiency with respect to the speed for 30.0 km/h to $ = 90.0 km/h

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