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The cost of fuel in running an engine is proportional to the square of speed in km/h and is Rs. 64 per hour when the speed is 16 km/h. Other cost amount is 100 per hour. Find speed which would minimize the cost.

Answer» The cost of fuel in running an engine is proportional to the square of speed in km/h and is Rs. 64 per hour when the speed is 16 km/h. Other cost amount is 100 per hour. Find speed which would minimize the cost.


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