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A tank has two inlet pipes which can fill the empty tank in 12 hours and 15 hours working alone and one outlet pipe which can empty the full tank in 8 hours working alone. The inlet pipes are kept open for all the time but the outlet pipe was opened after 2 hours for one hour and then again closed for 2 hours then once again opened for one hour. This pattern of outlet pipe continued till the tank got completely filled. In how many hours the tank has been filled, working on the given pattern?

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Important Questions on Time and Work

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Quantum CAT Also Useful for XAT>Chapter 8 - SNAP>CMAT>Q 56
Working together, two pipes A and B can fill 7 empty tanks of the same capacity in 48 hours. When a tank was initially empty, pipe B was kept open for as much time as was required by pipe A to fill 1 / 3rd of the empty tank by itself. Then, pipe A was kept open for as much time as was required by pipe B to fill up 1/4th of the empty tank by itself. It was then found that the tank was 7/12 full. The least time in which any of the pipes can fill an empty tank fully is
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Quantum CAT Also Useful for XAT>Chapter 8 - SNAP>CMAT>Q 6
Ram Lal is a renowned packager of fruits in Varanasi. He packs 70 mangoes or 56 guavas every day working 7 hours per day. His wife also helps him. She packs 30 mangoes or 24 guavas working 6 hours per day. Ram Lal has to pack 3300 mangoes and 2400 guavas with the help of his wife. They work alternatively, each day 10 hours. His wife started packaging on the first day and works on every alternate days. Similarly Ram Lal started his work on second day and worked alternatively till the completion of the work. In how many days the work will be finished?