# Two pipes A and B can independently fill a tank completely in 20 and 30 minutes

Time Work
Two pipes A and B can independently fill a tank completely in 20 and 30 minutes respectively. If both the pipes are opened simultaneously, how much time will they take to fill the tank completely?

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

### Answer

Let capacity of tank be 60 litres (LCM of 20 & 30)

Pipe A can fill 3 litres in one minute. Pipe B can fill 2 litres in one minute.

Both pipes can fill 5 litres in one minute.

Time required = 60/5 = 12 minutes

**The correct option is C.**