5 and 6 hours(0) +0 uuu18. Pipes A and B can fill a tank in 5 and 6respectively. Pipe C can empty it in 12 hoursThe tank is half full. All the three pipes areoperation simultaneously. After how much timewill the tank will be full.

5 and 6 hours(0) +0 uuu18. Pipes A and B can fill a tank in 5 and 6res

1.	5 and 6 hours(0) +0 uuu18. Pipes A and B can fill a tank in 5 and 6respectively. Pipe C can empty it in 12 hoursThe tank is half full. All the three pipes areoperation simultaneously. After how much timewill the tank will be full.
Answer» Use harmonic MEAN to solve this type of QUESTIONS,, To FILL or EMPTY it is same. therefore when three pipes fill the tank simultaneously, it takes 3/[(1/a)+(1/b)+(1/c)] =>3/[(1/5)+(1/6)+(1/12)]=3/[(12+10+5)/60] =>3*60/27=60/9=20/3=6.66,, we REQUIRED half tank to fill, therefore 20/6=3.333 or 6.66/2=3.333. Therefore it takes 3.33hours!!

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5 and 6 hours(0) +0 uuu18. Pipes A and B can fill a tank in 5 and 6respectively. Pipe C can empty it in 12 hoursThe tank is half full. All the three pipes areoperation simultaneously. After how much timewill the tank will be full.​

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5 and 6 hours(0) +0 uuu18. Pipes A and B can fill a tank in 5 and 6respectively. Pipe C can empty it in 12 hoursThe tank is half full. All the three pipes areoperation simultaneously. After how much timewill the tank will be full.