Three pipes of same capacity A,B,C can fill a tank in 18 hours. If there are only two pipes B and A of same capacity, the tank can be filled in?  Select the correct option.
A) 16  B) 19  C) 27  D) 24  E) 29
The part of the tank filled by three pipes in one hour   = 1/6   =&gt; The part of the tank filled by two pipes in 1 hour   = 2/3 * 1/18= 1/27.   The tank can be filled in 27 hours.   Answer:27
<result>C</result>
Three pipes of same capacity A,B,C can fill a tank in 18 hours. If there are only two pipes B and A of same capacity, the tank can be filled in?