Q1. Learning Curve 

Benson Racing is training a new pit crew for its racing team. For its first practise run, the pit crew is able to complete all the tasks in exactly 30 seconds. On its second attempt the crew improve by 4.5 seconds.

1. Determine the learning rate based on the above timings.
2. It has been determined that the crew should complete all tasks in 15 seconds to be competitive. How many times will the crew need to practise to reach this target?

Is it realistic to expect the crew to improve indefinitely?