Well, we don't actually know where its destination is,
so we can't answer the letter of the question.
All we can offer is the time it takes the airplane
to cover the 5,000 km.
Time = (distance) / (speed)
= (5,000 km) / (790 km/hr)
= (5,000 / 790) hr
= 6.33 hours
(6 hours 19 minutes 44.8 seconds)