A cistern can be filled by two pipes A and B in 10 and 15 hours respectively…
2023
A cistern can be filled by two pipes A and B in 10 and 15 hours respectively and is then emptied by a tap in 8 hours.If all the taps are opened,the cistern will be fill in:
- A.
21 hours
- B.
22 hours
- C.
23 hours
- D.
24 hours
Attempted by 20 students.
Show answer & explanation
Correct answer: D
Sol:Time takes to fill the tank, if all pipes are opened = (1/10 )+(1/15) -(1/8)=(5/120)=1/24i.e., 24hrs to fill the tank.