Three pipes of same capacity can fill a tank in 8 hours. If there are only two pipes of same capacity, the tank can be filled in. Options:
A) 22	B) 12	C) 88	D) 99	E) 77
The part of the tank filled by three pipes in one hour = 1/8   =&gt; The part of the tank filled by two pipes in 1 hour = 2/3 * 1/8 = 1/12.   The tank can be filled in 12 hours.   Answer:12
<result>B</result>
Three pipes of same capacity can fill a tank in 8 hours. If there are only two pipes of same capacity, the tank can be filled in.