Answer:
It cannot be said with 100% guarantee.
Explanation:
Since bird is travelling with 18 meters per second, that means that it covers a distance of 18 meters in 1 second.
for part 1 we convert 20 minutes into seconds, thus, 20 * 60 = 1200 seconds.
Distance covered in 1200 seconds will be:
S = v * t (S is distance , v is speed, t is time)
18 * 1200 = 21600 meters = 21.6 Kilometers
If the bird took less than 20 minutes than distance covered would be less than 21.6 Kilometer which could be greater than or lesser than 21 Kilometers. On average we can say that the distance bird travelled will be less than 21 Kilometer. But it is not definite.
For part B convert 0.4 hours into seconds to find the distance it travelled.
0.4 * 60 * 60 = 1440 seconds
Distance covered will be
18 * 1440 = 25920 meters = 25.9 Kilo meters.
Again, if the bird takes less than 0.4 hours to cover the lake, the lake will be less than 25.9 kilometers long. This means that it could be greater than or lesser than 21 kilometers. It cannot be definitive
