So, we need to find the speed of the flying bird and it is traveling at 45km/h.
Let's put this in fractions:
45 km / 1 h = 1800 km / x h
45/1 = 1800/x
45 = 1800/x
Multiply both sides by x:
45x = 1800
Divide both sides by 45:
x = 40
So it takes 40 hours for that bird.