a water tank has three inlets. inlet 1 can fill the tank in 30 min...inlet 2 can fill it in 40min... inlet 3 can fill it in 60 min... if all the three inlets are opened together how long will it take to fill the tank..

Here is the answer to your question.

 
Inlet 1 can fill the tank in 30 minutes.

 
Hope! This will help you.
Cheers!

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