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PIPES & CISTERNS - PART 4
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PIPE & CISTERNS - PART 4

Pratiyogita Mantra is teaching live on Unacademy Plus

Pratiyogita Mantra
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I've just started preparing for UPSC. <Engineer+MBA> Didn't know anything about Polity, came across your Crash Course, thought of giving it a try. I must say your course has made me like this subject a lot and can't thank you enough for providing a good base. Wish you all the success in life, Venkatesh!
sir isme mujhe 60units ki jgh 57 units ka logic bilkul smjh nh aaya...sir jb effective work done hi 1unit h 2min mein toh 57units se kyu kiya h ?? plzz reply sir..thnk u
Sanjeet Saroha
a year ago
it's just a trick to avoid confusion and getting the wrong ans. just go step by step..in the 114th min. 57 part will be filled out of 60. now in the next min ie 115th min ,3 parts will be added by A and hence the tank is filled.
Sanjeet Saroha
a year ago
mujhe b confusion thi ..but khud kr k dekha to smjh aaya
Sanjeet Saroha
a year ago
mujhe b confusion thi ..but khud kr k dekha to smjh aaya
Bht ache se concept clear kiya sir aapne. Mai is que m bht confuse rhti thi pr ab nhi
sir last walle que mai to hume 81 bnana hai....when A will come......to sir aapne 90 ki value kyu li...jb A aya.......
sir 90-9 samajh me nahi aaaya ise ratna padega
Krvn reddy
a year ago
90-9 done because if u keep filling efficiency 9 lit per 1 min,tank will never be emptied. so cap 90 se 9 ko minus kiya toh hame bachega only empty ka,i hope u understand.
Arun Kumar
a year ago
thank you
aa gya sir.....smajh mai...sry.....80 to hume 4*20 krke nikal liya baad mai.....80+9 krke 89 aya.....thank you sir
  1. PIPES & CISTERNS PART 4


  2. DON'T FORGET TO PRESS HIT LIKE FOLLOW RATE ASK YOUR DOUBTS ENROLL/SAVEIN COMMENTS


  3. PIPES & CISTERNS PART 4


  4. PIPES & CISTERNS PART 4 HIT LIKE A cistern is provided with two pipes A and B. A can fill it in 20 minutes and B can empty it in 30 minutes. If A and B be kept open alternately for one minute each, how soon will the cistern be filled? (1) 121 minutes (2) 110 minutes (3) 115minutes (4) 120 minutes RATE ASK YOUR DOUBTS IN DONT FORGET TO PRESS FOLLOW ENROLL/SAVE COMMENTS


  5. +3 6 23 57 57 LTR IRI MEN- IIS MEN6o ANS.


  6. 2hrs 2 x35 x3S 7I has 75


  7. l20 B- 24 120-8 112 2MIN 3 R 37 119 76 8 : t. n .


  8. 2 3


  9. DON'T FORGET TO PRESS HIT LIKE FOLLOW RATE ASK YOUR DOUBTS ENROLL/SAVEIN COMMENTS