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UPSC CDS 1 2020 Math Paper

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Question : 48

Total: 100

In a water tank there are two outlets. It takes 20 minutes to empty the tank if both the outlets are opened. If the first outlet is opened, the tank is emptied in 30 minutes. What is the time taken to empty the tank by second outlet ?

30 minutes
40 minutes
50 minutes
60 minutes

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