Answer:
Butterfly will need 9.0579 days of flying at speed of 11.5 miles per hour to cover distance of 2500 meters.
Solution:
Speed of butterfly = 11.5 miles per hour
Butterfly should complete a trip of distance = 2500 miles
Need to calculate number of days (without counting rest)
As time required =

Time required by butterfly in hours

Now we need to convert number of hours in number of days
As 24 hours = 1 day


So butterfly will need 9.0579 days of flying at speed of 11.5 miles per hour to cover distance of 2500 meters.