There are two pipes which are functioning simultaneouly to fill a tank in 12 hours, if one pipe fills the tank 10 hours faster than other then how many hours second pipe will take to fill the tank ?
Choices
A) 30 hours  B) 35 hours  C) 40 hours  D) 42 hours  E) 41 hours
Explanation:   Lets suppose tank got filled by first pipe in X hours,   So, second pipe will fill the tank in X + 10 hours.   =&gt;1/X+1/X+10=1/12   =&gt;X=20   30 hoursNSWER IS 30 hours
<result>A</result>
There are two pipes which are functioning simultaneouly to fill a tank in 12 hours, if one pipe fills the tank 10 hours faster than other then how many hours second pipe will take to fill the tank ?