Geology please help?
San Francisco and Los Angeles are on opposite sides of the San Andreas fault. If the San Andreas fault for the past 30 million years has been undergoing offset at the rates that you calculated in Part 2.d., how many years will it take before the two cities are directly opposite each other?
a. 20 Myr
b. 45 Myr
c. 72 Myr
d. 12 Myr