A Diligent Student Has a Slow Leak in Her Bike

Short Answer

A diligent student has a slow leak in her bike tire, but has been too busy studying for exams to fix it.Assume that the pressure in the tire decreases at a rate proportional to the difference between the atmospheric pressure (15 lbs.)and the tire pressure.Monday at 6:00 pm she pumped up the pressure to 90 lbs.By 6:00 pm Tuesday it was down to 75 lbs.How much longer can she wait to pump up the tire if she wants to keep the pressure at a minimum of 45 lbs.? (Keep your answer in number of days from Monday at 6:00 pm, rounded to 2 decimal places.)