Answer:

MN means line joining point M to point N.
Actually, DIEDERICK drove faster than BROOK. What you can do to find out the answer, is divide. Brook drove 180 miles in 3 hours, so divide 180 by 3, and you get 60. If you divide 160 by 4, you get 40. So, that means that Diederick drove faster than Brook.
Area = pi * r^2 = pi * 3^2 = 9pi
that is 28.27 to nearest 1/100.