"Two pipes A and B can fill a tank in 6 hours and 4 hours respectively. If they are opened
Channel: Doubtnut
Date: 2020-04-12

"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`"