Answers

2014-06-09T18:01:57+08:00
IT WILL TAKE 8 HOURS IF THEY WORKED TOGETHER

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but why it takes longer to finish the manuscript if they work together? i think 8hrs is not really the answer. please explain to me how did you come up with that answer. thanks.
2014-06-09T20:44:12+08:00
Given:

rate of Elle =1/3
rate of Elle =1/5

req'd:
t=?

formula is:

work = rate x time

work done = 1 work so

1 = 1/3t + 1/5t

t = 1.875 hrs


1 5 1