The cyclist Rode the first 60 miles of the stage at 20 mph in the second 60 miles at 30 mph what was her average speed for the 120 mile ride

The problem involves compound interest of a present worth value to future worth value. In this case, we are given with a principal of $1000 and stated that after three years, $1100 is obtained. The rate is obtained from 1100 = (1+r)^3 *1000. r then is equal to 3.23%. Answer is A.