39 is rounded to the nearest whole. write down the minimum possible length it could have been

Aplane is taking off from bangladesh headed to new york city. at the same time, a plane from new york city is headed to bangladesh is also taking off. the plane bound to new york city is traveling at 600 mph, while the plane traveling to bangladesh is traveling at 400 mph. how far from new york city will the two planes meet if the distance between new york city and bangladesh is 8,000 miles?

Ihonestly have no clue if it's each or none.

Determine if the outside temperature is a function of the time of day or if the time of day is a function of temperature and explain why or why not.