Remember that sides AC and EG will correspond. By finding the ratio of the lengths of these sides, we can find the length of EF. The ratio of 4 to 16 simplifies to 1:4. This means that every side in ABDC is 1/4th of its corresponding side in EFHG. 16 times 4 is 64, so EF has a length of 64 units.
One class is 45 minutes. That's 90 minutes per week. 8 weeks times 90 minutes is 720 minutes. 720 minutes divided by 60 minutes in the hour is 12 hours. Answer C.
