Given:
Total distance = 1000 kilometer
Total time = 5 hours
To find:
Average speed = ?
Formula used:
=

Where
= average speed
s = total distance
t = total time
Solution:
Average speed of the jet is given by,
=

Where
= average speed
s = total distance
t = total time
=

= 200 km/ h
Thus, average speed of the jet is 200 km/h.
Hence, Option (A) is correct.