Mr. stenley employed a certain number of typist for his project. 8 days later 20

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Mr. stenley employed a certain number of typist for his project. 8 days later 20% of the typist left the job and it was found that it took as much time to complete the rest work from then as the entire work needed with all the employed typists. The average speed of a typist is 20 pages/hour. Minimum how many typist could be employed? 

3 hours
4 hours
5 hours
None of these

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