Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together then how long it will take to fill the tank?<br><br>

1. Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together then how long it will take to fill the tank?

[BB Assistant Director-2014 : 2014]

1. 12 min

2. 15 min

3. 25 min

4. 50 min

Answer

Comments