There is a leak in the bottom of a cistern. When the cistern
is thoroughly repaired, it would be filled in 3 ? hours. It
now takes half an hour longer. If the cistern is full, how
long will the leak take to empty the cistern?
(a) 24 hours
(b) 28 hours
(c) 21 hours
(d) 27 hours
(e) None of these
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Answer Posted / sagarkumar doltade
LCM of repaired tank and leak tank time=3*3.5=10.5 difference between efficiency is 1/2 then 10.5/1/2=21
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