Quantitative Aptitude Time and Work

If Dinesh and Prateek can complete a task in 20 days, Prateek and Prem can complete the same task in 30 days while Prem and Dinesh can complete the task in 15 days, then in how many days can Prem alone finish the work ? 

1
45 
2
36 
3
50 
4
40

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