I am completely lost, please advice what steps to take?

The motion of an avalanche is described by s(t) = 3t^2, where s is the distance in metres travlled by the leading edge of the avalanche at t seconds.

a) Find the distance travelled from 0 to 5 s

b) find the rate at which the avalanche is moving from 0 s to 10 s

c) find the rate at which the avalanche is moving at 10 s

d) How long, to the nearest second, does the leading edge of the avalanche take to move 600 m?