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The operating cost of a truck is 12+(x/6...

The operating cost of a truck is `12+(x/6)` per km when the truck travels x km/hour. If the driver earns 6 Rs. per hour, what is the most economical speed to operate the truck on a 400 km road? Also due to construction, the truck can travel only between 35 and 60 km/hour?

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`35 km//hr `
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