The time required to complete a job varies inversely as the number of people working. It too 4 hours for 7 electricians to wire a buikding. How long would it have taken 3 electricians to have done the job?

• time required = k *1/no.of electricians
  t=k/n
  4= k/7
  k=28
  t2=? n=3
  t2= k/3
  t2=28/3 = 9.333 hrs = 9hrs 19 min
  
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