Answer:
Let's define the zero in our axis as the park.
We know that Noah lives 9,000 meters away from the park, and that he bikes 300 meters per minute.
Then at the beginning, the position of Noah with respect to the park can be written as:
P(0s) = -9000m
This means that initially he is 9000m away from the park.
Now, each minute he moves 300 meters to the park, then after t minutes, the position is:
P(t) = -9000m + (300m/min)*t
With this equation we can find the time that takes Noah to arrive at the park:
When his position is equal to zero, it means that he is in the park (because we defined the position zero as the park).
P(t) = 0m = -9000m + (300m/min)*t
Now we can solve this for t.
9000m = (300m/min)*t
9000m/((300m/min) = t = 30 minutes.
