Installed 5793

A group of fitters installed the cable line in 9 changes, and the second group completed the same task in 1/3 less time.
How many shifts would the third group do the same work if, with all three groups working together, the assembly took 2 shifts?

Correct answer:

x =  4.5 h

Step-by-step explanation:

2 (1/9 +1/(99/3) + 1/x) = 1 2 (x/9+x/(99/3)+1)=x 0.444444x=2 94x=2 4x=18 x=18/4=4.5=4.5 h

2·(x/9 +x/(9-9/3) + 1) = x

4x = 18


x = 18/4 = 4.5

x = 9/2 = 4.5

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