# In How many Hours will the Tank be Filled by the All Pipe? If

Pipe A can fill a tank in 5 hours, pipe B in 10 hours and pipe C in 30 hours. If all the pipes are open, in how many hours will the tank be filled?

- 2
- 2.5
- 3
- 3.5

**Answer: (3) 3 hr**

**Explanation:-**

Pipe A can fill a tank = 5 hr

Then, pipe A can fill a tank in 1 hr = 1/5

Pipe B can fill a tank = 10 hr

Then, pipe B can fill a tank in a hr = 1/10

Pipe C can fill a tank = 30 hr

Pipe B can in 1 hr = 1/30

All the pipes can fill a tank in a hr = 1/5 + 1/10 + 1/30

= (6 + 3 + 1)/30

= 10/30

= 1/3 hr

Then, A, B & C can fill a tank = 3 hr.

Hence, the answer is (3) 3.