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?

  1. 2
  2. 2.5
  3. 3
  4. 3.5
Tahir Lecturer Asked on 26th July 2015 in Maths.
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1 Answer(s)

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.

Anurag Mishra Professor Answered on 26th July 2015.
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