Final answer:
The minimum amount of time for Brandon to reach the point 300 m downstream is 228 s.
Step-by-step explanation:
To find the minimum amount of time for Brandon to reach the point 300 m downstream, we need to calculate the time spent swimming across the river and the time spent running the rest of the way.
Using the Pythagorean theorem, we can find the diagonal distance Brandon needs to swim: √(60^2 + 300^2) = 306 m. Since Brandon swims at 2 m/s, the time spent swimming is 306 m / 2 m/s = 153 s.
The time spent running the remaining distance is 300 m / 4 m/s = 75 s.
Therefore, the minimum amount of time for Brandon to reach the point is 153 s + 75 s = 228 s.