Question 940063
Maya takes 12 hours to type a report
In 1 hr, she can type = 1/12 of report
 maya & her friend together can type  in 4 hrs
In 1 hr, they together can type 1/4 of report
In 1 hr, her friend alone can type  = {{{ 
(1/4)-(1/12)}}}
 ={{{1/4)*(12/12) -1/12}}}
 ={{{ 3/12-1/12}}}
 ={{{(3-1)/12}}}
 ={{{ 2/12}}}
={{{ 1/6}}} 
 In 1 hr , her friend alone can type  1/6 th report.
 To type full report , she will take 6 hours
Result:her alone can type in 6 hrs