Question

14. The time required to complete a job varies

inversely as the number of people working.
It takes 4 hours for 7 electricians to wire a
building. How long would it take 3
electricians to do the job?
A. 1 hr 43 min
C. 7 hr 30 min
B. 5 hr 15 min
D. 9 hr 20 min
inn

Answer 1

Answer: D is right

Step-by-step explanation: time is 4 hours when there are 7 electricians.

You multiply 4·7 = 28

Then there are 3 electricians who need x hours.

You solve 3x = 28 x ) 28/3 = 9,33 hours, also 9 h 20 min