You say you've "sorta figured out" part (a) - why don't you post your work and let us have a look at it?
Given the subject of the question, you should be able to find in your class notes two equations - one for distance travelled at a constant velocity, and one for total distance travelled at a constant acceleration. You need to set up an equation where these two distances are the same.
Once you've done that, the answers to parts (b) and (c) should be very easy to figure out.
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