Wake County has a special emergency rescue team. The team is practicing rescuing dummies from a smoke-filled building. The first time the team took 240 seconds (four minutes). The second time it took 180 seconds (three minutes).
a. What is the estimated learning rate for the rescue team based on this information?
b. Suppose the team's learning rate for the rescue exercise is 80%. How many times will the team need to repeat the exercise until its time is less than 120 seconds (50% of the original time)?
c. How long will it take the emergency team to per- form its 20th rescue if the learning rate is 80%?