A runner goes for a long run in the mountain covering 25kilometers in five hours. Her distance is described by the function.
d(t) =
35
t3
+
35
t
Where d(t) is in km and t is in hours, 0 st 35
The derivative function is given as .
>> d(t) = 2 2 -
35
35
t +
2
Find the runners minimum speed and the time when this occurs