To determine the number of minutes needed by Barb to test a computer, we can use the information provided in the table.
We know the following about Barb:
- The time needed to set up 1 computer is 48 minutes.
- In a 40-hour workweek (which is 2400 minutes), Barb can set up 50 computers and test an unknown number of computers.
From the table, we can check how many minutes Barb has left for testing after setting up the computers.
First, let's calculate the time Barb spends setting up the computers:
- Time spent setting up 50 computers: \(50 \text{ computers} \times 48 \text{ minutes/computer} = 2400 \text{ minutes}\).
Since Barb works 2400 minutes in a week, that does not leave her any time for testing. So the assumption that she could test any computers is inaccurate if she works a full 40-hour week.
However, we need the time taken for testing a computer, which we can derive from Jim's data since it seems Barb and Jim switch tasks efficiently.
From Jim's information:
- Jim takes 30 minutes to set up a computer and tests 40 computers in 40 hours.
If Jim can test 60 computers in the same week, we check how many minutes he spends testing:
- \(60 \text{ computers} \times 30 \text{ minutes/computer} = 1800 \text{ minutes}\) for testing.
Since the above does not match Barb's setup time in those hours, this indicates we can also derive Barb's time from Jim's response.
Given we already established Barb's setup occupies all of Jim’s indicated time, we derive Barb's testing time assuming it meets compatible ranges.
We verify Barb's time as less than full time, suggests a direct constraint to establish max efficiency which shows:
- 2400 - 2400 = 0
In essence, Barb's testing shouldn’t be over 60 minutes (via choice), but she needs more inclusion to match tasks per contribution.
If we analyze task ratio, we select a direct statement on Barb correlating Jim suggests matching time frames either pulls each relative on setup tasks thus:
Implying, if testing for Barb falls to ratios: \[ \text{ Testing Time = } (70-40) \sim range of optimal worked hours.\] Hence solution should propose: Thus,
- 40 computers yielding around comparable setups afford that listed proportions:
The accurate number defined is 60 minutes per test. Thus the answer is d. 60.