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The reduction in speed, r,in miles per h...

The reduction in speed, r,in miles per hour, of an engine having n bogies attached to it is given as : ` r = 4sqrt(n)` . The final spee d , s, in miles per hour , at which the engine can pull then bogies attached is given as: `s = 40 - r` . What is the speed of the train , to the nearest tenths, in miles per hour, when there are 15 bogies attached ?

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