A boy and girl together fill a cistern with water. The boy pours 4 liters of water every 3 minutes and girl pours 3 litres every 4 minutes. How much time will it take to fill 100 litres of water in the cistern?
Aishvarya Shree is saying 48 minutes is correct answer
A cistern can be filled by two pipes in 20 and 30 minutes respectively. Both pipes being opened, when the first pipe must be turned off so that the cistern may be filled in 10 minutes more.
- [A] after 10 minutes
- [B] after 12 minutes
- [C] after 20 minutes
- [D] after 8minutes