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:

  1. 10 minutes
  2. 12 minutes
  3. 15 minutes
  4. 25 minutes
Monis Rasool Professor Asked on 21st May 2015 in Maths.
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1 Answer(s)

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.

Anurag Mishra Professor Answered on 22nd May 2015.
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