# How Much Time Pipe will take to Filled the Tank

Two pipes can fill a tank in 20 minutes and 30 minutes respectively, If both the pipes are opened simultaneously, then the tank will be filled in:

- 10 minutes
- 12 minutes
- 15 minutes
- 25 minutes

**Answer: (2) 12 minutes**

A pipe can fil a tank = 20 min

Then a pipe fill tank in 1 min = 1/20

Another pipe fill a tank = 30 min

Another pipe fill tank in 1 min = 1/30

Both pipe can fill tank in 1 min = 1/20 + 1/30

= 5/60

= 1/12

So, both pipe can fill a tank = 12 min

Hence, both the pipes are opened simultaneous, then the tank will be filled in **12 minutes.**