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     EduGorilla 
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    An oil tank has four inlets. It is filled in 15 minutes if first three pipes are opened. It is filled in 18 minutes if first, third and fourth pipe are opened and in 30 minutes if only second and fourth pipe are opened. If all pipes are opened, the approximate time taken to fill the tank will be?

    Options :-

    1. 12.85 minutes
    2. 12.75 minutes
    3. 12.35 minutes
    4. 12.55 minutes
    5. 12.70 minutes
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Reply To: An oil tank has four inlets. It is filled in 15 minutes if first three pipes are opened. It is fille….
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