TS ICET 1 Oct 2020 Shift 1 Paper

Question : 97 of 200

Marks: +1, -0

Two pipes

{P}_{1}

and

{P}_{2}

can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened simultaneously, but after 4 minutes, pipe

{P}_{1}

is turned off. What is the total time required to fill the tank?

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