Amigrating bird flew across a lake at an average speed of 18 meters per second. was the distance that the bird flew across the lake less than 21 kilometers

Yes

Explanation:

Given

Average speed of migrating bird is

18 m/s can be written as 64.8 km/h

i.e. on average bird can flew a distance of 64.8 km in 1 hour

if we set the time frame of 1 hour then average distance is 64.8 km , which is greater than 21 km

Thus we can say that if average speed of bird is 18 m/s then it can travel a distance of 21 km in 1 hour                                  

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