Aplane flies round-trip to philadelphia. it flies to philadelphia at 220 miles per hour and back home with a tailwind at 280 miles per hour. if the total flying time takes 6.5 hours, how many miles does the plane fly round trip?

Let hh represent the number of hummingbirds and ss represent the number of sunbirds that must pollinate the colony so it can survive until next year. 6h+4s > 746h+4s> 74 this year, 88 hummingbirds pollinated the colony. what is the least number of sunbirds that must pollinate the colony to ensure that it will survive until next year?