A = velocity / time
b) 40m/s
13m / 3s = 4.33 m/ss
Here is the answer with an explanation!
-96-(-86) -10 -2
------------= ------= -----= -2
82-87 -5 1
Ratio of dog bark is 4:5
Multiply that by 20 each side
Ratio is now 80:100
So 80%
If they walk past 45 time you just have to multiply the ratio 4:5 by 9
36:45
So the dog would bark 36 times
