"Two pipes A   and B can fill a tank in 6 hours and 4 hours respectively. If they are opened on alt
Channel: Doubtnut
Date: 2020-07-05

"Two pipes A
 
  and B can fill a tank in 6 hours and 4 hours respectively. If they are opened on alternate hours and if
 
  pipe A is opened fist in how many hours the tank shall be full?
 `4`
 b. `5`
 c. `4 1/2`
 d. `5 1/2`"