Well, the rate of which it's growing will be told by the derivative of the population equation.
so take the derivative of P(t):
P(t) simplified is: 3000+60t+3000t^2
derivative of P(t)=90+6000t
then plug in 1 for t
so when t=1 the population is growing at a rate of 62 bacteria per hour
(plug into calculator to check)