n a cybersecurity operations center, h (t ) represents the number of hacking attempts detected per hour, and j (t ) represents the center's countermeasure deployment rate (in terms of countermeasures activated per hour). At a critical moment, the number of hacking attempts is 200 per hour and is changing at a rate of 15 attempts per hour due to an ongoing cyber attack. Concurrently, the countermeasure deployment rate is 255 countermeasures per hour but is challenged by system limitations, changing at a rate of -7 countermeasures per hour. Determine the rate of change of the total defense capability h (t ) * j (t ) at this crucial instant