Question

A bobsled team is practicing runs on a track. Their first run takes 4.85 minutes. On each of the next two runs, the team’s time changes by −512% compared to the previous time.

A photo of a bobsled on a track is shown.
Question 1
Part A

What was the team’s time, rounded to the nearest hundredth of a minute on their final run?

Answer 1

Answer: The team's time on the final run can be found by successively multiplying their first time by (1 - 0.512) twice:

First run time: 4.85 minutes

Second run time: 4.85 * (1 - 0.512) = 2.37 minutes

Third run time: 2.37 * (1 - 0.512) = 1.15 minutes (rounded to the nearest hundredth)

So the team's time on their final run was 1.15 minutes.

Explanation: