I need help with these two question, please explain in details. thank you so much

Aircraft can be hampered by fog. Consider that the temperature is 293K and the relative humidity is 45% at the height of the low-altitude aircraft's flight path. How much would the temperature have to drop for fog to form through condensation if the aircraft remains in air of similar pressure and composition? An exhaust stream exits a plant at 1atm and 160C at a rate of 1m3/hr. Unfortunately, it includes 60,000 ppm of heptane, which was used as a solvent. Not only will this heptane contribute to ozone formation upon release, but this solvent costs $1.80/L. The lost solvent, which has a specific gravity of 0.7, must be replaced when it exits in the exhaust. Consider proposing a cost-benefit analysis to the plant manager. One solution is to cool the exhaust stream, which requires energy and equipment. To recover 35% of the heptane before it is released to the atmosphere, what temperature would the exhaust need to be before exiting? How much money could the proposed equipment and operation cost per day while still breaking even