Raman, Naman and Aman are roommates and were given a job to clean their room on Sundays. The job was easy, but they made it complicated. Sometimes they did it in pairs, sometimes individually, sometimes they did it all together. At the end of the month, a mathematician had following observations:
1. Aman needed 1 hour less than Raman to complete the work.
2. When they all worked together, they required 60 minutes to do complete job.
3. When Raman and Naman started working together and Raman left after 1 hour, then Naman had to work further for 3 more hours to complete the job.
The mathematician wants you to calculate how much work does Aman do per hour?

• Aman takes 2 hrs to complete the job.
  so he completes 1/2 job per hour.
  Raman takes 3 hrs.
  Naman takes 6 hrs.
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