A cistern is normally filled in 6hours but takes two hours longer to fill because of a leak its bottom. if the cistern is null the leak will empty it in
[A] 16 h
[C] 18 h
[B] 17 h
[D] 24 h

• work done by leak in 1 hr=(1/6-1/8)=1/24
  so leak will empty cistern in 24 hrs
  
• 11 years agoHelpfull: Yes(14) No(0)
• rate of leak = 1/6 - 1/8 = 1/1/24 cis./hrs. = 24 hrs./cis.
• 10 years agoHelpfull: Yes(0) No(0)
• Its full not null. Because null cistern can not be empty. Ans is 24.
• 10 years agoHelpfull: Yes(0) No(0)
• work done by leak in 1 hr=(1/6-1/8)=1/24
  so leak will empty cistern in 24 hrs
  
• 9 years agoHelpfull: Yes(0) No(0)
• work done by leak = time to normally fill the tank - total time to fill the tank with leakage
  so work done by leak= (1/6 - 1/[6+2]) = (1/6- 1/8) = 1/24
  hence the leak will empty it in 24 hrs.
• 5 years agoHelpfull: Yes(0) No(0)