Q5 Q24.) How far has the plane flown?

hello Greenrune113
 how is your day going?
so I'm, not the best at this but I will try to help u.
so l think the answer to this is.
drum roll plz.
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sin(13°)= 900/c

c= 900/sin(13°)



4000.870334

rounded would be like 
4001

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l hope this helps u

have a fantastic day 
if u need more help feel free to let me know 
and if this is not the answer plz let me know 
-toby out!