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OM PRAKASH MEENA

· started a discussion

· 1 Months ago

help (Question: 271926.0 )

sir i could not get right answer
i request to top ranker please solve this qes by parmount method
help me

Question:

Tap A fills a tank in 20 min while B empties it at  13   rd the rate at which A fills it. At 5 pm, A and B are simultaneously started and the tank is 50% full, tap A is turned off. At what time will the tank be empty?

Options:
A)

12 : 00 AM

B)

5 : 30 PM

C)

5 : 45 PM

D)

6 : 00 PM

Solution:

Ans: (c)

  

Pankaj Kumar

· commented

· 1 Months ago

effi. of A is 3 a/c to qsns
A takes 20 mnuts, thus total work =60
also B eff. is 1.
thus it takes 60 minus to empty
now use paramount method
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