Physics help!!!

This was a problem on my quiz, but for some reason, I didnt think that there was enough info to solve it.  HELP ME 4CHAN!!!



A car activates its breaks when its at a velocity of 30m/s.  Coeff of friction btw car and ground is 0.2.  find out how much time does it take the car to come to a complete stop.

this was the EXACT question, with no extra info provided.

could be that you are supposed to make a suggestion for the amount of mass. I have had fucked up teachers like that.