A veterinarian has instructed Harrison to give his 105−lb dog one 325−mg aspirin tablet for arthritis. The amount of aspirin A remaining in the dog's body after t minutes can be expressed by the exponential equation A = 325( 1 2 ) t 13 . How long will it take for the amount of aspirin to drop to 60 mg? Express your answer to the nearest tenth. It will take about minutes for the amount of aspirin to drop to 60 mg.