Question 1182486
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This problem is posed INCORRECTLY.



As it is worded, printed, posted and presented,  it is  Physically  WRONG.



It is Physically wrong,  since in real life situation,  the rate of work of two engines, 

in the sense and in the context of this problem,  IS NOT  the sum of rates 

of individual engines,  due to non-linear nature of a drag force.     *)



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*)  The Physics fact, well known to any Mechanical engineer.