I have a question that I just can't figure out. I'm not sure on how to set it up. Can anyone help me with it?
The question is:
You want to take a hot-air balloon ride on a summer day when the temperature is 25 degrees Celsius. To what temperature must you heat the air inside a 40-ft diameter balloon to lift two people(average weight 150lb) and the basket and balloon, which together weigh 100lb.