Two circles with radii of 4 and 8 are drawn with the same center. The smaller inner circle is painted purple, and the part outside the smaller circle and inside the larger circle is painted blue. What is the ratio of the areas painted blue to the area painted purple?
Phoebe reaches her office 1 minute early by traveling at a speed of 25 km/h and reaches 20 minutes late by traveling at a speed of 20 km/h. By how much time will she be early or late if she travels at 30 km/h?