Pulse rate of an athlete the pulse rate the number of

Question

Question: PULSE RATE OF AN ATHLETE The pulse rate (the number of heartbeats/minute) of a long-distance runner t sec after leaving the starting line is given by

P(t) = 300√(½t² + 2t + 25)            (t ≥ 0)
                    t + 25

Compute P'(t). How fast is the athlete's pulse rate increasing 10 sec, 60 sec, and 2 min into the run? What is her pulse rate 2 min into the run?